Opposite: placed over against, or opposed to.
Optic: relating to the organs of vision.
Optic ganglia: are at the sides of the procerebrum and innervate the compound eyes.
Optic lobes: the laterals lobes of the procerebrum in which are centered the nerves supplying the organs of vision.
Opticon: the first of a series of three ganglionic swellings in the optic nerve: see epiopticon and periopticon.
Optic segment: =procerebral segment; q.
Optic tract: is the perceptive portion of the compound eye.
Ora: a border: specifically in some Coleoptera, the lateral margin of prothorax.
Ora coleopterorum: the margin of the elytra.
Orad: toward the mouth.