Merriam-Webster Collegiate Dictionary - corps

 noun  (plural ~)  Etymology: French, from Old French cors, from Latin corpus body  Date: 1707  1.  a. an organized subdivision of the military establishment Marine Corps Signal Corps  b. a tactical unit usually consisting of two or more divisions and auxiliary arms and services  2. a group of persons associated together or acting under common direction; especially a body of persons having a common activity or occupation the press ~  3. ~ de ballet