A person who is an especially close and trusted friend over a long period of time.

(linguistics, uncommon) A word in a language bearing a deceptive resemblance to a word in another language, and at least one meaning in common, but not all.

Alternative form of fair-weather friend.

(idiomatic, euphemistic) A recovering alcoholic, especially one who is a member of the organization Alcoholics Anonymous.

(slang) The penis.

An animal that is regarded as a good friend, usually a dog or a horse.

bacterial pneumonia.

(law, Australia, Britain, Hong Kong, New Zealand, Canada) A barrister on the opposing side of a dispute; a member of opposing counsel.

(Internet slang) A suggestion that an individual could learn something using an Internet search engine, rather than asking others.

(informal) A person with whom one has only a very casual and superficial friendship.