Merriam-Webster's Collegiate® Dictionary, 11th Edition
REFRAIN
I. verb see: frenum
Date: 14th century
transitive verb curb , restrain , intransitive verb to keep oneself from doing, feeling, or indulging in something and especially from following a passing impulse , refrainment noun
II. noun see: refract
Date: 14th century
a regularly recurring phrase or verse especially at the end of each stanza or division of a poem or song ; chorus