mustelidan|mʌˈstɛlɪdən| [f.mod.L. Mustēlid-æ (f.Mustēlus a genus of dog-fishes, altered from L. mustēla weasel) + -an.] A shark of the family Mustelidæ, typified by the genus Mustelus. 1859–62Sir J. Richardson, etc. Mus.Nat.Hist. II. 165 Mustelidans (Mustelidæ).