Source : Webster's Revised Unabridged Dictionary (1913)

Full-grown \Full"-grown`\, a.
   Having reached the limits of growth; mature. ``Full-grown
   wings.'' --Lowell.

Source : WordNet®

full-grown
     adj : (of animals) fully developed; "an adult animal"; "a grown
           woman" [syn: {adult}, {big}, {fully grown}, {grown}, {grownup}]