Stem·ma n.; pl. Stemmata Zool. (a) One of the ocelli of an insect. See Ocellus. (b) One of the facets of a compound eye of any arthropod.
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stemma
n 1: a tree diagram showing a reconstruction of the transmission
of manuscripts of a literary work
2: the descendants of one individual; "his entire lineage has
been warriors" [syn: lineage, line, line of descent,
descent, bloodline, blood line, blood, pedigree,
ancestry, origin, parentage, stock]
3: an eye having a single lens [syn: simple eye, ocellus]
[also: stemmata (pl)]