Hematophagous Animals that feed on blood
Hepatic Pertaining to the liver
Hepatitis Inflammation of the liver
Hepatocellular Pertaining to or affecting liver cells
Hepatocyte Main cell of the liver forming the parenchyma
Hepatoma Neoplasia whose parenchymal cells resemble
those of the liver
Hepatomegaly Enlargement of the liver
Hepatotoxic Having an injurious effect on liver cells
Heteropagus Unequal conjoined twins where the imperfectly developed ‘parasite’ is attached to the ventral
portion of the autosite
Histology Microscopic study of the structure of tissues
Histochemistry Specific and sometimes quantitative identification of chemical substances in tissues
Histopathology The microscopic study of diseased tissues
Histiocytic Animal cell that is part of the mononuclear
phagocyte system
Histozoic Process of living within tissues but outside of the
cell
Holocarpic Entire thallus developed into a fruiting body or
sporangium
Holarctic Refers to habitats in the northern part of the
northern hemisphere
Horizontal transmission Transfer of disease between
individuals in a population
Hyaline degeneration Active accumulation (by pinocytosis) of protein in cytoplasmic organelles
Hyaloplasm Fluid portion of the cytoplasm as distinguished from the granular and netlike components
Hydatid Cyst formed by larvae of a tapeworm
Hydrocoele embryonalis Yolk sac dropsy
Hydropic swelling Intracellular oedema of keratinocytes
Hyperaemia Active, local congestion of blood in any part
of the body
Hypercellularity Increase in number of cells
Hyperchromasia Increased colouring
Hyperpigmentation Darkening of an area of skin caused
by increased melanin
Hyperplasia Increase in number of cells in a tissue with a
corresponding increase in size of the tissue or organ
Hypertonic A solution with a higher salt concentration
than normal cells
Hypertrophy Increase in size of individual cells and
thereby also increase in size of the organ
Hypochromic Deficiency in colouring or pigmentation
Hypoplasia Excessive smallness of an organ or part,
resulting from imperfect growth (reduced number of
cells)
Hypoplastic anaemia Failure of the haematopoietic tissue
to produce adequate numbers of cells
Hypoproteinaemia Decreased amounts of total protein in
the circulating blood plasma
Hypotrophy Diminution in size, subnormal growth
Hypoxia A state of reduced oxygen supply to a tissue,
organ or whole animal
Idiopathic Disease state of unknown or spontaneous origin
Incidence Number of cases developing per unit of population per unit of time
Inclusion bodies Round or oval bodies occurring in nuclei
or cytoplasm especially at site of virus multiplication
Indurate The process of hardening or being hardened
Infarction Death of a section of tissue because the blood
supply has been cut off
Infection Growth of pathogenic microorganisms in the
body, whether or not body function is impaired
Infestation Incidence of a parasite which may lead to, or
cause disease
Infiltration Penetration of the surrounding tissues, leaking
of fluid into the tissues
Inflammation Complex reaction of living tissues to injury
characterised clinically by heat, swelling and redness
Intercellular Between cells
Intermyotomal Between muscle blocks
Interrenal tissue Region where the major corticosteroid
cortisol is produced
Interstitial Pertaining to the space between structures and
tissue
Interstitium Space between (functional) parts of a tissue
or organ
Intracellular Within cells
Intrahepatic Within the liver
Intraventricular Within a ventricle
Invagination Pushed forward forming a pouch
In vitro Tests or experiments conducted in an artificial
environment
In vivo Tests or experiments on living organisms
Ischemia Deficient blood supply to part of the body or an
organ
Karyolysis Necrotic change resulting in loss of nuclear
morphology due to hydrolysis of chromatin following
cell death
Karyomegaly Increase in the nuclear size of tissue cells
Karyorrhexis Nuclear membrane ruptures and the cell
nucleus fragments following cell death
Kelt A salmon that has spawned and is in poor physical
condition
Keratitis Inflammation with subsequent opacity of the cornea
Kypholordosis Coexistence of kyphosis and lordosis
Kyphosis An excessive upward curvature of the dorsal
spine resulting in ‘roundback’ or ‘hunchback’
Lacuna A space between cells
Lamellae Plate-like structures of the gills where gas
exchange occurs
Leiomyoma Benign neoplasia of smooth muscle
Leiomyosarcoma Malignant neoplasia of smooth muscle
Glossary
199
Hepatic Pertaining to the liver
Hepatitis Inflammation of the liver
Hepatocellular Pertaining to or affecting liver cells
Hepatocyte Main cell of the liver forming the parenchyma
Hepatoma Neoplasia whose parenchymal cells resemble
those of the liver
Hepatomegaly Enlargement of the liver
Hepatotoxic Having an injurious effect on liver cells
Heteropagus Unequal conjoined twins where the imperfectly developed ‘parasite’ is attached to the ventral
portion of the autosite
Histology Microscopic study of the structure of tissues
Histochemistry Specific and sometimes quantitative identification of chemical substances in tissues
Histopathology The microscopic study of diseased tissues
Histiocytic Animal cell that is part of the mononuclear
phagocyte system
Histozoic Process of living within tissues but outside of the
cell
Holocarpic Entire thallus developed into a fruiting body or
sporangium
Holarctic Refers to habitats in the northern part of the
northern hemisphere
Horizontal transmission Transfer of disease between
individuals in a population
Hyaline degeneration Active accumulation (by pinocytosis) of protein in cytoplasmic organelles
Hyaloplasm Fluid portion of the cytoplasm as distinguished from the granular and netlike components
Hydatid Cyst formed by larvae of a tapeworm
Hydrocoele embryonalis Yolk sac dropsy
Hydropic swelling Intracellular oedema of keratinocytes
Hyperaemia Active, local congestion of blood in any part
of the body
Hypercellularity Increase in number of cells
Hyperchromasia Increased colouring
Hyperpigmentation Darkening of an area of skin caused
by increased melanin
Hyperplasia Increase in number of cells in a tissue with a
corresponding increase in size of the tissue or organ
Hypertonic A solution with a higher salt concentration
than normal cells
Hypertrophy Increase in size of individual cells and
thereby also increase in size of the organ
Hypochromic Deficiency in colouring or pigmentation
Hypoplasia Excessive smallness of an organ or part,
resulting from imperfect growth (reduced number of
cells)
Hypoplastic anaemia Failure of the haematopoietic tissue
to produce adequate numbers of cells
Hypoproteinaemia Decreased amounts of total protein in
the circulating blood plasma
Hypotrophy Diminution in size, subnormal growth
Hypoxia A state of reduced oxygen supply to a tissue,
organ or whole animal
Idiopathic Disease state of unknown or spontaneous origin
Incidence Number of cases developing per unit of population per unit of time
Inclusion bodies Round or oval bodies occurring in nuclei
or cytoplasm especially at site of virus multiplication
Indurate The process of hardening or being hardened
Infarction Death of a section of tissue because the blood
supply has been cut off
Infection Growth of pathogenic microorganisms in the
body, whether or not body function is impaired
Infestation Incidence of a parasite which may lead to, or
cause disease
Infiltration Penetration of the surrounding tissues, leaking
of fluid into the tissues
Inflammation Complex reaction of living tissues to injury
characterised clinically by heat, swelling and redness
Intercellular Between cells
Intermyotomal Between muscle blocks
Interrenal tissue Region where the major corticosteroid
cortisol is produced
Interstitial Pertaining to the space between structures and
tissue
Interstitium Space between (functional) parts of a tissue
or organ
Intracellular Within cells
Intrahepatic Within the liver
Intraventricular Within a ventricle
Invagination Pushed forward forming a pouch
In vitro Tests or experiments conducted in an artificial
environment
In vivo Tests or experiments on living organisms
Ischemia Deficient blood supply to part of the body or an
organ
Karyolysis Necrotic change resulting in loss of nuclear
morphology due to hydrolysis of chromatin following
cell death
Karyomegaly Increase in the nuclear size of tissue cells
Karyorrhexis Nuclear membrane ruptures and the cell
nucleus fragments following cell death
Kelt A salmon that has spawned and is in poor physical
condition
Keratitis Inflammation with subsequent opacity of the cornea
Kypholordosis Coexistence of kyphosis and lordosis
Kyphosis An excessive upward curvature of the dorsal
spine resulting in ‘roundback’ or ‘hunchback’
Lacuna A space between cells
Lamellae Plate-like structures of the gills where gas
exchange occurs
Leiomyoma Benign neoplasia of smooth muscle
Leiomyosarcoma Malignant neoplasia of smooth muscle
Glossary
199