The Collaborative International Dictionary
Microseme
Microseme \Mi"cro*seme\, a. [Micro- + Gr. ? sign, mark: cf. F. micros[`e]me.] (Anat.) Having the orbital index relatively small; having the orbits broad transversely; -- opposed to megaseme.
Wiktionary
microseme
a. (context anatomy English) Having the orbital index relatively small; having the orbits broad transversely.