Mon opter us (mon opter us)

[NL. (cf. Gr. μονόπτερος, lit. having one wing (see monopteron), pela go, about 3 feet lo II. n. A monopterygian fish. Monopterygii (mō-nop-te-rij'i-i), n. pl. [NL., μόνος , single, + πτέρυξ (πτερυγ-), fin.] Fishes whose fins are reduced to one. Bloch and Schneider.