裸ら鰓さい類るいMeanings1nounnudibranchsTaxonomic term for the order Nudibranchia, a group of soft-bodied marine gastropods. Used mainly in biological contexts.裸ら鰓さい類るいは美うつくしい色しき彩さいを持もつものが多おおい。Many nudibranchs have beautiful colors.