Haem"a*to*blast (?), n. [Haemato- + -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.
<-- = hemocytoblast, hematocytoblast. Precursor of erythroblasts, lymphoblasts, and myeloblasts, found mostly in bone marrow. Hayem's hematoblast = a platelet -->
© Webster 1913.