Definition of malacopterygii:

part of speech: noun plural

Cuvier's second great order or division of osseous fishes, having the rays of the fins soft or jointed.

Usage examples:

• Mahout, alleged short life, 222. Malacopterygii abdominales, 362. sub- branchiati, 362. apoda, 362. Mammalia, 3. Monkeys, 5. Rilawa, 5. Wanderoo, 6. error as to the Ceylon Wanderoo, 6, n. J. Emerson Tennent in "Sketches of the Natural History of Ceylon".