ATONIC (2)

A‐ton″ic, n. 1. 1. (Gram.) A word that has no accent.
2. 2. An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing. Rush.
3. 3. (Med.) A remedy capable of allaying organic excitement or irritation. Dunglison.