The Collaborative International Dictionary of English v.0.48:

Metrify \Met"ri*fy\, v. i. [L. metrum meter + -fy: cf. F.
   m['e]trifier.]
   To make verse. [R.] --Skelton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

metrify
    v 1: compose in poetic meter; "The bard metrified his poems very
         precisely"
    2: convert from a non-metric to the metric system [syn:
       metricize, metricise, metrify, metricate]