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Ophthalmology Specialization of medicine which deals with the functions, structure and diseases of the eye
Optical axis of lens/principal axis Straight line passing through the geometrical
centre of a lens and two centres of curvature
Optical centre of lens Central point of the lens through which a ray of light passes
without suffering any deviation
Organic Compound containing carbon and hydrogen
Orphan site (in the context of solid waste) Site contaminated by hazardous waste
with no responsible party identified
Orthopaedics Specialization of medical science concerned with the correction of
deformities of bones/muscles
Osmosis Movement of water molecule from less concentration to higher concentration region
Otorhinolaryngology Specialization of medicine which is concerned with of diseases of the ear, nose and throat
Ozone (O3) Gas with three oxygen atoms
Paediatrics Branch of medical science dealing with children and their diseases
Parallel force Forces whose lines of action of forces are parallel to each other
Parasitism Interaction between organisms in which one organism benefits and
other is harmed
Particulate matter Solid/liquid substance with size greater than a molecule but
less than microscopic/submicroscopic size (about 500 μ)
Particulates Particles with size more than molecule and less than 500 mm
Pathogenic Capable of causing disease
Pathogens Microorganisms that have the ability to cause sickness
Pathology Specialization of medical science that deals with cause, origin and
nature of disease
Penal law Legislation which prohibits acts and imposes penalties for the violations
of those acts
Penalty Punishment imposed as the consequence for violation of law
Percolate To trickle through a permeable material
Perfect fluid Fluid with zero viscosity
Perfectly elastic body A body that returns to its original configuration completely
and immediately after removing deforming force from it
Period of wave Time taken for the oscillation to repeat itself
Pest An organism that is harmful to environment or health
Phagocytosis Membrane engulfs solid particles from surroundings
Pharmacology Specialization of medical science that is concerned with the uses,
effects and modes of action of medicines
Physiology Specialty of medical science that deals with the functions of living
beings and their parts
Phytoplankton The plant forms of plankton
Pili Small hair-like outgrowths present in many species of bacteria that assist in
attaching to other cells/surfaces
Pilot programme A trial run of project/equipment/structure on a small scale
Glossary
Ophthalmology Specialization of medicine which deals with the functions, structure and diseases of the eye
Optical axis of lens/principal axis Straight line passing through the geometrical
centre of a lens and two centres of curvature
Optical centre of lens Central point of the lens through which a ray of light passes
without suffering any deviation
Organic Compound containing carbon and hydrogen
Orphan site (in the context of solid waste) Site contaminated by hazardous waste
with no responsible party identified
Orthopaedics Specialization of medical science concerned with the correction of
deformities of bones/muscles
Osmosis Movement of water molecule from less concentration to higher concentration region
Otorhinolaryngology Specialization of medicine which is concerned with of diseases of the ear, nose and throat
Ozone (O3) Gas with three oxygen atoms
Paediatrics Branch of medical science dealing with children and their diseases
Parallel force Forces whose lines of action of forces are parallel to each other
Parasitism Interaction between organisms in which one organism benefits and
other is harmed
Particulate matter Solid/liquid substance with size greater than a molecule but
less than microscopic/submicroscopic size (about 500 μ)
Particulates Particles with size more than molecule and less than 500 mm
Pathogenic Capable of causing disease
Pathogens Microorganisms that have the ability to cause sickness
Pathology Specialization of medical science that deals with cause, origin and
nature of disease
Penal law Legislation which prohibits acts and imposes penalties for the violations
of those acts
Penalty Punishment imposed as the consequence for violation of law
Percolate To trickle through a permeable material
Perfect fluid Fluid with zero viscosity
Perfectly elastic body A body that returns to its original configuration completely
and immediately after removing deforming force from it
Period of wave Time taken for the oscillation to repeat itself
Pest An organism that is harmful to environment or health
Phagocytosis Membrane engulfs solid particles from surroundings
Pharmacology Specialization of medical science that is concerned with the uses,
effects and modes of action of medicines
Physiology Specialty of medical science that deals with the functions of living
beings and their parts
Phytoplankton The plant forms of plankton
Pili Small hair-like outgrowths present in many species of bacteria that assist in
attaching to other cells/surfaces
Pilot programme A trial run of project/equipment/structure on a small scale
Glossary