The Collaborative International Dictionary
Siluroid
Siluroid \Si*lu"roid\, n. [Silurus + -oid.] (Zo["o]l.) Belonging to the Siluroidei, or Nematognathi, an order of fishes including numerous species, among which are the American catfishes and numerous allied fresh-water species of the Old World, as the sheatfish ( Silurus glanis) of Europe. -- n. A siluroid fish.
Wiktionary
siluroid
n. 1 (alternative form of silurid English) 2 A bi-quadratic (quartic) curve