a. 半圆的

[医] 半环形的

[ adj ]
curved into a half circle
<adj.all>

Semicircular \Sem`i*cir"cu*lar\, a.
Having the form of half of a circle. --Addison.

{Semicircular canals} (Anat.), certain canals of the inner
ear. See under {Ear}.

curved \curved\ adj.
1. not straight; having or marked by curves. Opposite of
{straight}.

Note: [Narrower terms: {arced, arched, arching, arciform,
arcuate, bowed}; {falcate, sickle-shaped}; {flexuous};
{incurvate, incurved}: {recurved, recurvate};
{semicircular}: {serpentine, snaky}: {sinuate, sinuous,
wavy}: {sinusoidal}]

Syn: curving.
[WordNet 1.5]

2. (Botany) curved with the micropyle near the base almost
touching its stalk; -- of a plant ovule. Opposite of
{orthotropous}.

Syn: campylotropous.
[WordNet 1.5]