‖Mac′ro‐chi″res (?), n. pl. [NL., fr. Gr. μακρόσ long + � hand.] (Zoöl.) A division of birds including the swifts and humming birds. So called from the length of the distal part of the wing.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.