| anaspid | (n) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian |
| anaspida | (n) extinct order of jawless vertebrates, Syn. order Anaspida |
| agassiz | (n) United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873), Syn. Louis Agassiz, Jean Louis Rodolphe Agassiz |
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