\Cor"pus*cle\ (-p[u^]s*s'l), n. [L. corpusculum, dim.
of corpus.]
1. A minute particle; an atom; a molecule.
2. (Anat.) A protoplasmic animal cell; esp., such as float
   free, like blood, lymph, and pus corpuscles; or such as
   are imbedded in an intercellular matrix, like connective
   tissue and cartilage corpuscles. See {Blood}.
         Virchow showed that the corpuscles of bone are
         homologous with those of connective tissue.
                                               --Quain's
                                               Anat.
{Red blood corpuscles} (Physiol.), in man, yellowish,
   biconcave, circular discs varying from 1/3500 to 1/3200 of
   an inch in diameter and about 1/12400 of an inch thick.
   They are composed of a colorless stroma filled in with
   semifluid h[ae]moglobin and other matters. In most mammals
   the red corpuscles are circular, but in the camels, birds,
   reptiles, and the lower vertebrates generally, they are
   oval, and sometimes more or less spherical in form. In
   Amphioxus, and most invertebrates, the blood corpuscles
   are all white or colorless.
{White blood corpuscles} (Physiol.), rounded, slightly
   flattened, nucleated cells, mainly protoplasmic in
   composition, and possessed of contractile power. In man,
   the average size is about 1/2500 of an inch, and they are
   present in blood in much smaller numbers than the red
   corpuscles.

\Cor"pus*cle\, n. (Physics)
An electron.