Available Definitions:
1) a. - Characterized by atony, or want of vital energy; as, an atonic disease.
2) a. - Unaccented; as, an atonic syllable.
3) a. - Destitute of tone vocality; surd.
4) n. - A word that has no accent.
5) n. - An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing.
6) n. - A remedy capable of allaying organic excitement or irritation.