any of an order (Coelacanthiformes) of lobefin fishes, now extinct except for the latimeria
See coelacanth in American Heritage Dictionary 4
(sēˈlə-kănthˌ)
noun
Any of various mostly extinct fishes of the order Coelacanthiformes, known only in fossil form until a single living species, Latimeria chalumnae of African marine waters, was identified in 1938.