behemoth \ bih-HEE-muhth \ , noun;
1. Any creature or thing of monstrous size or power
2. An animal, perhaps the hippopotamus, mentioned in the Book of Job.
All the sportive rollickings of all the animals, fromthe agile fawn to the unwieldly behemoth, aredances taught them by nature.
— Ambrose Bierce, They All Dance
Behemoth derives from the Hebrew b’hemoth in the Book of Job, but may be a folk etymology of Egyptian pehemau , “water-ox,” the name for the hippopotamus.