A‐ton″ic (�), a. [Cf. F. atonique. See Atony.] 1. (Med.) Characterized by atony, or want of vital energy; as, an atonic disease.
2. (Gram.) Unaccented; as, an atonic syllable.
3. Destitute of tone vocality; surd. Rush.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.