ulcer
(L. ulcus, ulcer). An abscess that
opens through the skin or a mucous
surface.
ultimate cause
(L. ultimatus, last, + causa).
The evolutionary factors responsible for the origin, state of being, or purpose of a
biological system.
umbilical
(L. umbilicus, navel). Refers to the
navel, or umbilical cord.
umbo
(um´bo), pl. umbones (L.
boss of a shield). One of the prominences
on either side of the hinge region in a
bivalve mollusc shell. Also, the "beak" of a
brachiopod shell.
ungulate
(L. ungula, hoof).
Hooved. Noun, any hooved mammal.
uniformitarianism
Methodological assumptions that
the laws of chemistry and physics have
remained constant throughout the history of
the earth, and that past geological events
occurred by processes that can be observed
today.
ureter
(Gr. oueter, ureter). Duct
carrying urine from kidney to bladder.
urethra
(Gr. ourethra, urethra). The
tube from the urinary bladder to the exterior
in both sexes.
uropod
(Gr. oura, tail, + pous, podos, foot). Posteriormost appendage of
many crustaceans.
utricle
(L. utriculus, little bag). That
part of the inner ear containing the
receptors for dynamic body balance; the
semicircular canals lead from and to the
utricle.
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