agrin

From a- +‎ grin.

• IPA^(key): /əˈ.ɡɹɪn/
• Rhymes: -ɪn

agrin (not comparable)

1. grinning; having happiness or satisfaction apparent on one's face
   • 1847, Alfred Tennyson, The Princess:

     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 and horseman, came
     As comes a pillar of electric cloud,
     Flaying the roofs and sucking up the drains,
     And shadowing down the champaign till it strikes

   • 1849, Charlotte Brontë, chapter III, in Shirley:

     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 were revealed all agrin and ashine with glee.

AGRN (“the name of the associated gene”) +‎ -in

• IPA^(key): /ˈæ.ɡɹɪn/

agrin (plural agrins)

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

• Nigra, Ragin, Rigan, grain, nigra, raign