Merriam-Webster's Collegiate® Dictionary, 11th Edition
SKIRL
I. verb
Etymology: Middle English (Scots) skrillen, skirlen to scream, shriek, of Scandinavian origin; akin to Norwegian dialect skræla to cry aloud; akin to Old English scrallettan to resound loudly
Date: circa 1665
intransitive verb to emit the high shrill tone of the chanter, transitive verb to play (music) on the bagpipe,
II. noun
Date: 1856
a high shrill sound produced by the chanter of a bagpipe