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Etymology 1[edit]

From a- +‎ grin.



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.

Etymology 2[edit]

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



agrin (plural agrins)

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