orthicon
— Noun
– English
～ a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
Orthilia
— Noun
– English
～ a shrubby perennial rhizomatous evergreen herb; grows in damp coniferous woodlands in northern temperate regions
orthoboric acid
— Noun
– English
～ a white or colorless slightly acid solid that is soluble in water and ethanol; used in the manufacture of glass and paper and adhesives and in detergents and as a flux in welding; also used as an antiseptic and food preservative
orthochorea
— Noun
– English
～ a form of chorea in which spasms occur mainly when the patient is erect