Acrid \Ac"rid\, a. [L. acer sharp; prob. assimilated in form to acid. See Eager.]

1. Sharp and harsh, or bitter and not, to the taste; pungent; as, acrid salts.

2. Causing heat and irritation; corrosive; as, acrid secretions.

3. Caustic; bitter; bitterly irritating; as, acrid temper, mind, writing.

Acrid poison, a poison which irritates, corrodes, or burns the parts to which it is applied.

Source: Webster's Revised Unabridged Dictionary (1913)