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Webster 1828 Edition

Adj.

[L. bis, twice, and lamella, a plate.]

Having the form of a flatted sphere, longitudinally bifid; used of the stigma of plants.

bilamellate ‎(not comparable)

(botany) Formed of two plates, or lamellae.
The stigma of the Mimulus is bilamellate.
(botany) Having two elevated ridges, as in the lip of certain flowers.