I·so·spon·dy·li n. pl. Zool. An extensive order of fishes, including the salmons, herrings, and many allied forms.
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Isospondyli
n : most primitive teleost fishes; all are soft-finned: salmon;
trout; herring; shad; sardines; anchovies; whitefish;
smelts; tarpon [syn: order Isospondyli]