Definition, Synonyms, Translations of laminae by The Free Dictionary lam·i·na  (lăm′ə-nə) n. pl. lam·i·nae (-nē′) or lam·i·nas 1. A thin plate, sheet, or layer. 2. Botany a. The expanded area of a leaf or petal; a blade. b. The bladelike part of a kelp. 3. A thin layer of bone, membrane, or other tissue. 4. Zoology A thin scalelike or platelike structure, as one of the thin layers of sensitive vascular tissue in the hoof of a horse. 5. Cytology A thin layer inside the nuclear membrane of a…