Source : Webster's Revised Unabridged Dictionary (1913)

Xenopterygii \Xe*nop`te*ryg"i*i\, n. pl. [NL., from Gr. xe`nos
   strange + ?, dim. of ? a wing.] (Zo["o]l.)
   A suborder of fishes including {Gobiesox} and allied genera.
   These fishes have soft-rayed fins, and a ventral sucker
   supported in front by the pectoral fins. They are destitute
   of scales.