ADR

Adverse drug reaction.

(uncountable) Alternative dispute resolution.

(countable) American depository receipt.

(uncountable, colloquial) "Additional dialogue replacement", "automatic dialogue replacement", "automated dialogue replacement", or "audio dialogue replacement"; replacement of an actor's voice with that of another actor, usually for translation purposes (professionally referred to as revoicing or dubbing).

(uncountable, veterinary medicine, slang) Ain't doin' right (the situation where an animal appears unwell but has not yet been diagnosed with any specific illness).