noun a word that has no accent.
2. atonic ·adj destitute of tone vocality; surd.
3. atonic ·adj unaccented; as, an atonic syllable.
4. atonic ·noun a remedy capable of allaying organic excitement or irritation.
5. atonic ·adj characterized by atony, or want of vital energy; as, an atonic disease.
6. atonic ·noun an element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing.