Noun | 1. | Argentinidae - small marine soft-finned fishes with long silvery bodies; related to salmons and trouts fish family - any of various families of fish Isospondyli, order Isospondyli - most primitive teleost fishes; all are soft-finned: salmon; trout; herring; shad; sardines; anchovies; whitefish; smelts; tarpon genus Argentina, Argentina - type genus of the Argentinidae: argentines |