ARMSCYE

i have knit since age 8, and sewn since i was a teen, and recently i came across this word in a sweater pattern.
armscye

Pronunciation: (ärm'sI, -zI), [key]
—n.
the armhole opening in a garment. Also,arms•eyePronunciation: (ärmz'I"). [key]

(found it in one dictionary, using Onelook.)

i understood it, but had never seen or heard it before. Since my parents were from ireland, i often heard words that i don't use--or heard words used in ways that are not common to US english--i don't think its a UK/English english word.

anyone else familier for this word to describe the hole in the side of a garment that is where you place the sleeve?