Early 18th century; earliest use found in Alexander Pennecuik (1652–1722), physician and poet. Apparently from anter, aunter, etc., variants of adventure + -in, variant of -ing.
Definition of antrin in US English:
antrin
adjectiveˈantrɪn
Northumberland, English Regional, Scottish
1Occasional, odd, chance.
2Peculiar, strange, singular.
Origin
Early 18th century; earliest use found in Alexander Pennecuik (1652–1722), physician and poet. Apparently from anter, aunter, etc., variants of adventure + -in, variant of -ing.