In pathology, characterized by atony, or want of tone or power: as, an atonic disease.
In philology: Unaccented. Produced by the breath alone; surd.
noun.
In medicine, a drug capable of allaying organic excitement or irritation.
noun.
In philology: A word or syllable that has no accent.
noun.
An elementary sound produced by the breath; a surd consonant; a breathing.