At″o‐ny (�), n. [Gr. � slackness; ἀ priv. + � tone, strength, � to stretch: cf. F. atonie.] (Med.) Want of tone; weakness of the system, or of any organ, especially of such as are contractile.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.