Croup \Croup\ (kr??p), n. [F. croupe hind quarters, croup, rump, of German or Icel. origin; cf. Icel. kryppa hump; akin to Icel. kroppr. Cf. Crop.]

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

So light to the croup the fair lady he swung, So light to the saddle before her he sprung. --Sir W. Scott.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Croup \Croup\ (kr??p), n. [Scot. croup, cf. croup, crowp, to croak, to cry or speak with a hoarse voice; cf. also LG. kropp, G. kropf, the crop or craw of a bird, and tumor on the anterior part of the neck, a wen, etc. Cf. Crop.]

(Med.) 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.

Source: Webster's Revised Unabridged Dictionary (1913)