a. 腹的, 腹部的, 腹面的

n. 腹鳍

[医] 腹的; 腹侧的, 前侧的

Ventral \Ven"tral\, a. [L. ventralis, fr. venter the belly;
perhaps akin to G. wanst: cf. F. ventral.]
1. (Anat.) Of, pertaining to, or situated near, the belly, or
ventral side, of an animal or of one of its parts; hemal;
abdominal; as, the ventral fin of a fish; the ventral root
of a spinal nerve; -- opposed to {dorsal}.

2. (Bot.)
(a) Of or pertaining to that surface of a carpel, petal,
etc., which faces toward the center of a flower.
(b) Of or pertaining to the lower side or surface of a
creeping moss or other low flowerless plant. Opposed
to {dorsal}.

{Ventral fins} (Zo["o]l.), the posterior pair of fins of a
fish. They are often situated beneath the belly, but
sometimes beneath the throat.

{Ventral segment}. (Acoustics) See {Loop}, n., 5.