A specialized reproductive appendage or modified fin in fish (especially livebearers) and crustaceans, used for transferring sperm during mating.
From Greek 'gono-' (reproductive) and 'podium' (foot/base), referring to a reproductive appendage. Singular form of gonopodia.
The gonopodium in guppies and other livebearing fish is basically a precision tool—it's adapted so perfectly for delivering sperm that scientists can use its exact shape to identify different species!
Complete word intelligence in one call. Free tier — 50 lookups/day.