From which features do condrichthyes and osteichthyes get these names?

From which features do condrichthyes and osteichthyes get these names?
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“Chondros” means cartilage, “ictis” means fish (both from the Greek); the name chondrichtians is for fishes with cartilaginous endoskeleton. The name osteichthyes comes from the existence of a bony endoskeleton in these fishes (“osteo” means bone, from the Greek too). Fish Facts - Image Diversity: chondrichthyes osteichthyes
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