semicircular

from WordNet (r) 3.0 (2006)

semicircular
    adj 1: curved into a half circle

from The Collaborative International Dictionary of English v.0.48

Semicircular \Sem`i*cir"cu*lar\, a.
   Having the form of half of a circle. --Addison.
   [1913 Webster]

   {Semicircular canals} (Anat.), certain canals of the inner
      ear. See under {Ear}.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

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]

from Moby Thesaurus II by Grady Ward, 1.0

26 Moby Thesaurus words for "semicircular":
      Cynthian, S-shaped, bicorn, corniform, crescent, crescent-shaped,
      crescentic, crescentiform, crescentlike, falcate, falciform,
      horn-shaped, horned, lunar, lunate, luniform, lunular, menisciform,
      meniscoid, moon-shaped, moonlike, semilunar, sickle-like,
      sickle-shaped, sigmoid, two-horned