Merriam-Webster's Collegiate® Dictionary, 11th Edition
CHAP
I. noun
Etymology: Middle English chappes, plural, from chappen
Date: 14th century
a crack in or a sore roughening of the skin caused by exposure to wind or cold,
II. verb (chapped; chapping)
Etymology: Middle English chappen; akin to Middle Dutch cappen to cut down
Date: 15th century
intransitive verb to open in cracks, slits, or chinks, transitive verb to cause to chap ,
III. noun
Etymology: origin unknown
Date: 1555
the fleshy covering of a jaw, the forepart of the face,
IV. noun
Etymology: short for chapman
Date: 1705
fellow 4c, baby , child ,
V. abbreviation chapter