agrin

Adjective

agrin (not comparable)

1. (predicative) Grinning; having happiness or satisfaction apparent on one's face.
   • Yea, let her see me fall! and with that I drave
     Among the thickest and bore down a Prince,
     And Cyril, one. Yea, let me make my dream
     All that I would. But that large-moulded man,
     His visage all agrin as at a wake,
     Made at me through the press, and, staggering back
     With stroke on stroke the horse...1847, Alfred Tennyson, The Princess
   • When a ray from a lantern (the three pedestrians of the party carried each one) fell on Mr. Moore's face, you could see an unusual, because a lively, spark dancing in his eyes, and a new-found vivacity mantling on his dark physiognomy; and when the rector's visage was illuminated, his hard features...1849, Currer Bell [pseudonym; Charlotte Brontë], “Mr. Yorke”, in Shirley. A Tale. […], volume I, London: Smith, Elder and Co., […], →OCLC, page 47

Noun

IPA/ˈæ.ɡɹɪn/

agrin (plural agrins)

1. a protein involved in the formation of neuromuscular junctions during embryonic development