As a quality of things: Having the property or capacity of causing death or fatal injury; poisonous, venomous, pestilential.

Strong, stout, powerful. Originally Scottish. Of a substance, esp. liquor: strong, potent. Now rare.

Of serpents, material substances, plants, etc.: Possessing venomous or strongly poisonous qualities; highly injurious or fatal to life; extremely…

esp. of disease, suffering, or death: Slow, painfully protracted. †Of poisons: Characterized by slow or tardy action. Obsolete.

Causing irritation, physical or (rarely) mental; irritating. Chiefly in Pathology, of poisons, etc.

Of, relating to, or resulting from intoxication (cf. intoxication, n. 1b 3a).