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Webster 1913 Edition

Adj.

(Med.)

Tending to prevent sleep.

–

Noun.

An antihypnotic agent.

Adj.

[Gr. sleep.]

Counteracting sleep; tending to prevent sleep or lethargy.

Noun.

A medicine that prevents or tends to prevent sleep.

antihypnotic ‎(not comparable)

antihypnotic ‎(plural antihypnotics)