tunicierscommon nounSyllable DecompositiontuniciersEtymologyexpandDefinition1. Very small animals, formerly classified among the polyps, which form a distinct order in the class of acephalous mollusks. Their mantle is fused with a leathery envelope that surrounds them like a tunic, hence their name.zoologieexpandHyperonymsAnimauxBilatériensDeutérostomiensChordataTranslationsSee alsotunique (cn.)