order of marine mammals containing whales, 1830, Modern Latin, from Latin cetus “any large sea creature” (whales, seals, dolphins), from Greek ketos “a whale, a sea monster,” of unknown origin, + -acea. Hence cetology “the study of whales,” first attested 1851 in “Moby Dick.”


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  • Cetacean

    belonging to the Cetacea, an order of aquatic, chiefly marine mammals, including the whales and dolphins. a cetacean mammal. adjective of, relating to, or belonging to the Cetacea, an order of aquatic placental mammals having no hind limbs and a blowhole for breathing: includes toothed whales (dolphins, porpoises, etc) and whalebone whales (rorquals, right whales, […]

  • Cetaceum


  • Cetane

    a colorless, liquid hydrocarbon of the alkane series, C 16 H 34 , used as a solvent and in cetane number determinations. noun a colourless insoluble liquid alkane hydrocarbon used in the determination of the cetane number of diesel fuel. Formula: C16H34 Also called hexadecane cetane (sē’tān’) A colorless liquid hydrocarbon derived from petroleum. It […]

  • Cetane-number

    a measure of the ignition quality of a diesel engine fuel by comparison with various mixtures in which the alpha form of methylnaphthalene is given a standard value of 0 and cetane is given a standard value of 100. noun a measure of the quality of a diesel fuel expressed as the percentage of cetane […]

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