: a class of mollusks including the squids, cuttlefishes, and octopuses that have a tubular siphon under the head, a group of muscular arms around the front of the head which are usually furnished with suckers, highly developed eyes, and usually a bag of inky fluid which can be ejected for defense or concealment
—ceph·a·lo·pod\ˈsef-ə-lə-ˌpäd\adjective or noun
—ceph·a·lop·o·dan\ˌsef-ə-ˈläp-əd-ən\adjective or noun
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