LAMELLIBRANCH Meaning of LAMELLIBRANCH in English [ lə'mɛlɪbraŋk ]■ noun another term for bivalve .OriginC19: from mod. L. Lamellibranchia (former class name), from L. lamella + Gk brankhia 'gills'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004