Merriam-Webster's Collegiate® Dictionary, 11th Edition
WRINKLE
I. noun see: co-
Date: 14th century
a small ridge or furrow especially when formed on a surface by the shrinking or contraction of a smooth substance ; crease ,
2. method , technique , a change in a customary procedure or method, something new or different ; innovation , imperfection , irregularity , wrinkly adjective
II. verb (wrinkled; wrinkling)
Date: 15th century
intransitive verb to become marked with or contracted into wrinkles, transitive verb to contract into wrinkles ; pucker