Hæm"a*to*blast` (-blăst`),
n. [Hæmato- + -blast.]
(Anat.) One of the very minute, disk-shaped bodies found
in blood with the ordinary red corpuscles and white corpuscles; a
third kind of blood corpuscle, supposed by some to be an early stage
in the development of the red corpuscles; -- called also blood
plaque, and blood plate.