sclera--prophetes.ai

‖ sclera
  (ˈsklɪərə)
  [mod.L. f. Gr. σκληρός hard.]
  The sclerotic coat of the eyeball.

1888 J. M. Clarke in Jrnl. Morphol. II. 261 Immature eyes, in which the sclera has attained no excessive growth.

Oxford English Dictionary