The Collaborative International Dictionary
Erythroid
Erythroid \Er"y*throid\, a. [Gr. 'eryqro`s red + -oid: cf. Gr. ?.] Of a red color; reddish; as, the erythroid tunic (the cremaster muscle).
Wiktionary
erythroid
a. 1 Having a red colour; reddish 2 Of or pertaining to the erythrocytes, especially to their development
WordNet
erythroid
adj. relating to erythrocytes