lamina Syllabification: (lam·i·na)Pronunciation: /ˈlamənə/Definition of lamina noun (plural laminae /-ˌnē, -ˌnī/) technical a thin layer, plate, or scale of sedimentary rock, organic tissue, or other material. Derivatives laminosePronunciation: /-ˌnōs, -ˌnōz/ adjective Origin: mid 17th century: from Latinlamina in other Oxford dictionaries Definition of lamina in the British & World English dictionary