側そく生せい動どう物ぶつ

noun

parazoan

Technical term in zoology for a member of the subkingdom Parazoa, whose only extant representatives are sponges. Rare outside academic contexts.

• 側そく生せい動どう物ぶつは、海かい綿めん動どう物ぶつのみが現げん生せいする原げん始