Abbreviation of American Locomotive Company.

A small South American dog, domesticated by the natives. Apparently the species has since gone extinct.

(slang, UK, Australia) An alcoholic.

alcohol

plural of alco

(informal) An enthusiast of locomotives etc. built by the American Locomotive Company.

plural of alco-holic

(architecture) A small recessed area set off from a larger room. / A shady retreat.

(chiefly Britain) Alternative form of nonalcoholic

(organic chemistry, countable) Any of a class of organic compounds (such as ethanol) containing a hydroxyl functional group (-OH). / (colloquial) Ethanol.