Dictionary.com
Thesaurus.com

waterbrain

American  
[waw-ter-breyn, wot-er-] / ˈwɔ tərˌbreɪn, ˈwɒt ər- /

noun

Veterinary Pathology.
  1. gid, in sheep.


waterbrain British  
/ ˈwɔːtəˌbreɪn /

noun

  1. vet science an archaic name for gid

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of waterbrain

water + brain