1. (Deity) Mysterious god of the ocean, and of sea monsters in particular. Strange, with an alien mentality, and unknowable motives. Sometimes thought to be malevolent but may merely be indifferent to humanity. Occasionally prayed to by fishermen, begging his forgiveness for robbing his ocean.
2. (Sea Monster) Cetus is a term used occasionally to refer to any particularly large, frightening sea-monster, weather it be a Leviathan, or any of the other myriad horrors of the sea, as reference to the deity of the same name (see def. 1.)
See also: Leviathan