American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Having fins supported by flexible cartilaginous rays; not spiny-finned. Used of bony fishes.
Century Dictionary and Cyclopedia
- In ichthyology, having no fin-spines; spineless; anacanthine; malacop-terous; malacopterygian. See Malacopterygii.
GNU Webster's 1913
- adj. (Zoöl.) Having the fin rays cartilaginous or flexible; without spines; -- said of certain fishes.
- adj. of or relating to fish with soft fins
“He placed the sturgeon in his Cartilaginous series; while in his soft-finned order he found a place for the Polypterus of the Nile and the Lepidosteus of the”
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