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Definition of Cetecean:
Any of an order (Cetacea) of aquatic mostly marine mammals that includes the whales, dolphins, porpoises, and related forms and that have a torpedo-shaped nearly hairless body, paddle-shaped forelimbs but no hind limbs, one or two nares opening externally at the top of the head, and a horizontally flattened tail used for locomotion[1].
This is the common definition for Cetecean, other definitions can be discussed in the article


  1. Merriam-Webster Online Dicationary [1]