The Collaborative International Dictionary of English v.0.48:

Atones \At*ones\, adv. [See At one.] [Obs.]
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         Down he fell atones as a stone.          --Chaucer.
   [1913 Webster] Atonic \A*ton"ic\, a. [Cf. F. atonique. See
   Atony.]
   1. (Med.) Characterized by atony, or lack of vital energy;
      as, an atonic disease.
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   2. (Gram.) Unaccented; as, an atonic syllable.
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   3. Destitute of tone vocality; surd. --Rush.
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