labial palps
174
L
labial palps folds in front of the mouth that take part in the collection or selection of food; in, e.g., Bivalvia.
LAD last appearance datum, ~biohorizon.
lagoon shallow stretch of seawater (channel, sound, bay, salt-water lake) near
the sea andlor communicating with it, and partly or completely separated
from the sea by a low, narrow, elongate strip of land (reef, barrier island, sandbank, (sand)spit).
lag phase generally the phase between stimulus and effect, more specifically the
period after inoculation of a population of microorganisms before growth
begins.
Lagrangian representation representation of the motion of a fluid by noting the
movement of the fluid elements along their trajectories. ~Euler-lagrange transformation.
Lamellibranchia (lamellibranchs) ~Bivalvia.
laminar flow flow that is not turbulent, but in which the friction is caused by
(molecular) viscosity.
land ice any ice formed on land, even though it may later flow into the sea like
icebergs. Compare sea ice.
Langmuir circulation a type of small-scale circulation observed in the upper layers of seas or lakes, named after the physicist Irving Langmuir, who studied
langmuir circulation. (After
Knauss 1978)