Ocular fringe: in Mallophaga, closely set small hair on posterior half of ocular emargination, sometimes extending on temporal margin.
Ocular lobes: of brain = procerebrum; q.v.
Ocular sclerite: the first or protocerebral segment of the head.
Ocular tubercles: in Aphids, are a group of prominent facets on the hinder part of each eye.
Oculi -us: the eyes: an eye: refers to the compound eyes.
Oculocephalic: applied to that pair of imaginal buds destined to produce the cephalic region in Hymenoptera.
Odona: toothed: applied to Odonata by Fabricius because of the long teeth on the maxilla and labium.
Odonata: net-veined insects with mandibulate mouth; head free; thorax agglutinate; wings similar, elongate, flat; metamorphosis incomplete; copulatory organs of male near base of abdomen, separate from the testes. {Scanner's comment: Dragonflies and damselflies}
Odonate: bearing toothed mouth parts, like those of dragon flies.
Odoriferous: diffusing an odor; applied to glands or secreting organs.