the eye, in anatomy. See there, n° 142.

OCULUS Belli, in natural history, one of the semipellucid gems, of a greyish white colour, variegated with yellow and with a black central nucleus: it is of a roundish form, and its variegations very beautifully represent the pupil and iris of the eye; whence the name.

OCULUS Mundi, or Lapis Mutabilis. See Hydrophanes.

OCULUS Catil. See Asteria.

OCYMOphyLLON, in botany: a name given by Buxbaum to a new genus of plants, the characters of which are these: The flower is of the staminous kind, having no petals; this stands upon the embryo fruit, which afterwards becomes an oblong quadrangular seed-vessel, divided into four cells, and containing roundish and very small seeds; its leaves are like those of the common ocyum or basil, whence its name; and its place of growth is in damp marshes. Boccone has described it under the improper name of glaux, calling it the great, green-flowered, marjol glaux.