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Webster 1913 Edition

(rĭth′mẽr or rĭth′-)

Noun.

One who writes in rhythm, esp. in poetic rhythm or meter.

[R.]

One now scarce counted a

rhythmer

, formerly admitted for a poet.

Fuller.

rhythmer ‎(plural rhythmers)

One who writes in rhythm, especially in poetic rhythm or meter.
One now scarce counted a rhythmer, formerly admitted for a poet. — Fuller.