Nouns in english starting with O

• opsin — Noun – English ～ retinal protein formed by the action of light on rhodopsin
• opsonin — Noun – English ～ an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
• opsonisation — Noun – English ～ process whereby opsonins make an invading microorganism more susceptible to phagocytosis
• opsonization — Noun – English ～ process whereby opsonins make an invading microorganism more susceptible to phagocytosis
• optative mood — Noun – English ～ a mood (as in Greek or Sanskrit) that expresses a wish or hope; expressed in English by modal verbs
• optative — Noun – English ～ a mood (as in Greek or Sanskrit) that expresses a wish or hope; expressed in English by modal verbs
• Optez — Noun – English ～ an artificial language
• optic chiasma — Noun – English ～ the crossing of the optic nerves from the two eyes at the base of the brain
• optic disc — Noun – English ～ the point where the optic nerve enters the retina; not sensitive to light
• optic chiasm — Noun – English ～ the crossing of the optic nerves from the two eyes at the base of the brain
• optic axis — Noun – English ～ in a doubly refracting crystal, the line in the direction of which no double refraction occurs; "a crystal may have either one or two optic axes"
• optic — Noun – English ～ the organ of sight
• optic disk — Noun – English ～ the point where the optic nerve enters the retina; not sensitive to light
• optic nerve — Noun – English ～ the cranial nerve that serves the retina
• optic axis — Noun – English ～ a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"
• optic cup — Noun – English ～ (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina
• optical fiber — Noun – English ～ a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
• optical flint — Noun – English ～ optical glass of high dispersion and high refractive index
• optical crown — Noun – English ～ optical glass of low dispersion and low refractive index
• optical glass — Noun – English ～ clear homogeneous glass of known refractive index; used to make lenses

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