Croup

The hinder part or buttocks of certain quadrupeds, especially of a horse; hence, the place behind the saddle.

An inflammatory affection of the larynx or trachea, accompanied by a hoarse, ringing cough and stridulous, difficult breathing; esp., such an affection when associated with the development of a false membrane in the air passages (also called membranous croup). See False croup, under False, and Diphtheria.

a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing

the part of an animal that corresponds to the human buttocks