octaethylporphyrinA synthetic porphyrin compound with eight ethyl groups on its ring structure. It forms a stable, aromatic macrocycle that can bind metals and is commonly used as a model system for studying hemelike chemistry.
octafinalThe round in eliminations preceding the quarterfinal round; in single-elimination playoffs, this is the round of 16.
octafluorideany fluoride containing eight fluorine atoms in each molecule
octafluorocyclobutaneThe organofluorine compound C₄F₈, related to cyclobutane by replacement of all C–H bonds with C–F bonds, and used as a deposition gas and etchant in semiconductor manufacture.
octafluoropropaneThe fluorocarbon perfluoropropane; a greenhouse gas used in plasma etching, refrigeration, and ultrasound
octaglucosideAny glucoside that has eight glucose units
octaglutamateAny compound that has eight glutamate groups or anions
octagonA polygon with eight sides and eight angles.
octagonalShaped like an octagon, in having eight sides and eight angles.
octahydronaphthaleneA partially hydrogenated derivative of naphthalene with the molecular formula C₁₀H₁₆ and it consists of two fused six-membered carbon rings and contains one remaining carbon-carbon bond.
octahydroxyEight hydroxy functional groups in a molecule
octahydroxyanthraquinoneA highly hydroxylated organic compound derived from the anthraquinone molecule. It consists of an anthraquinone core with eight hydroxyl groups attached, one at every available position on the aromatic rings.
octaironEight iron atoms or cations in a molecule (Fe₈)
octalogyA set of eight works of art that are connected, and that can be seen either as a single work or as eight individual works. They are commonly found in literature, film, or video games.
octameterA line of verse containing eight metrical feet
octamethyl(in combination) eight methyl groups in a molecule
octamethylcyclotetrasiloxaneA cyclic silicone compound made of a ring of silicon and oxygen atoms with methyl groups attached. It’s mainly used as a raw material for making silicones and as a volatile ingredient in cosmetics and personal care products to give a smooth feel and help other ingredients spread evenly.
octamethyleneEight methylene groups in a molecule (typically in a row, with substituents or functional groups at each end)
octamethylpyrophosphoramideA synthetic organophosphorus compound that was developed as an insecticide. It works by disrupting nerve function in insects by inhibiting acetylcholinesterase, an enzyme essential for normal nervous system activity.
octaneAny of the eighteen isomeric aliphatic hydrocarbons (C₈H₁₈) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents.
octanedioneAny of several isomeric diketones, derived from octane, that are used as intermediates in organic synthesis
octanethiolAny thiol derived from an octane, but especially 1-octanethiol
octangleA geometric figure with eight corners, an octagon.
octanoicOf or pertaining to octanoic acid or its derivatives
octanolAny of many isomers of the saturated aliphatic alcohol having eight carbon atoms, but especially the simple primary alcohol n-octanol; its esters are used in perfumery
octansA small circumpolar constellation of the southern sky, said to resemble an octant. It lies closest to the southern celestial pole of any constellation.
octantThe eighth part of a circle; an arc of 45 degrees.
octarepeatA sequence of octapeptides that are repeated in a polypeptide or protein
octarhodiumEight rhodium atoms or cations in a molecule (Rh₈)
octarineThe color of magic, a notional extra color distinct from the colors of the rainbow / normal visible light spectrum, which is said (chiefly in certain fiction but also by some occultists) to be visible to users of magic.
octariusThe pint (eighth of a gallon) in the apothecaries' system.