How to sign: a fully differentiated structural and functional unit in an animal that is specialized for some particular function
Categories: body part
Within this category: contractile organ, ctene, effector, end organ, erectile organ, external organ, foot, gland, internal organ, lens, organelle, ovipositor, primordium, reproductive organ, sense organ, speech organ, stinger, sucker, taret organ, target organ, tongue, vital organ, wing