The Collaborative International Dictionary of English v.0.48:

Corpus \Cor"pus\ (-p[u^]s), n.; pl. Corpora (-p[-o]*r[.a]).
   [L.]
   A body, living or dead; the corporeal substance of a thing.
   [1913 Webster]

   Corpus callosum (k[a^]l*l[=o]"s[u^]m); pl. Corpora
      callosa (-s?) [NL., callous body] (Anat.), the great band
      of commissural fibers uniting the cerebral hemispheres.
      See Brain.

   Corpus Christi (kr[i^]s"t[imac]) [L., body of Christ] (R.
      C. Ch.), a festival in honor of the eucharist, observed on
      the Thursday after Trinity Sunday.

   Corpus Christi cloth. Same as Pyx cloth, under Pyx.

   Corpus delicti (d[-e]*l[i^]k"t[imac]) [L., the body of the
      crime] (Law), the substantial and fundamental fact of the
      comission of a crime; the proofs essential to establish a
      crime.

   Corpus luteum (l[=u]"t[-e]*[u^]m); pl. Corpora lutea
      (-[.a]). [NL., luteous body] (Anat.), the reddish yellow
      mass which fills a ruptured Graafian follicle in the
      mammalian ovary.

   Corpus striatum (str[-i]*[=a]"t[u^]m); pl. Corpora
      striata (-t[.a]). [NL., striate body] (Anat.), a ridge in
      the wall of each lateral ventricle of the brain.
      [1913 Webster]

WordNet (r) 3.0 (2006):

corpus luteum
    n 1: yellow endocrine tissue that forms in a ruptured Graafian
         follicle following the release of an ovum; it degenerates
         after a few days unless pregnancy has begun