BathybiusBa*thyb"i*us\, n. [NL., fr. Gr. ? deep + ? life] (Zo["o]l.) A name given by Prof. Huxley to a gelatinous substance found in mud dredged from the Atlantic and preserved in alcohol. He supposed that it was free living protoplasm, covering a large part of the ocean bed. It is now known that the substance is of chemical, not of organic, origin.