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Ohio a Midwestern U.S. state between Pennsylvania and Indiana. (abbr.: OH) [2 definitions]
ohm a unit of electrical resistance equal to the resistance of a circuit in which an electromotive force of one volt produces a current of one ampere.
ohmmeter an instrument that measures electrical resistance directly in ohms.
-oid resembling (whatever is specified); having the characteristics of. [2 definitions]
oil any of numerous mineral, animal, plant, or synthetic substances that are viscous, usu. liquid, and greasy, and that are soluble in ether or alcohol but not in water. [7 definitions]
oil cake a compressed cake of ground linseed, cottonseed, soybean, or the like, from which the oil has been extracted, used as feed or fertilizer.
oilcloth a heavy smooth cloth that has been treated with oil and other materials to make it waterproof, and that is often used to line cupboards or as a tablecloth.
oil color a paint made of pigment ground in oil, usu. linseed; oil paint.
oil field an area having large deposits of oil, esp. one with many wells.
oil of vitriol see sulfuric acid.
oil painting a painting executed in oil colors. [2 definitions]
oilpaper paper made transparent and water-resistant by soaking in oil.
oil shale shale containing hydrocarbons that yield petroleum.
oilskin a cloth treated with oil to make it waterproof. [2 definitions]
oil slick a film of oil floating on water.
oilstone a smooth, fine-grained, oiled whetstone, used for fine sharpening.
oil well a well from which petroleum is drawn or pumped.
oily of, concerning, or like oil. [3 definitions]
oink a sound representing the grunt of a pig. [2 definitions]
ointment any of various usu. semisolid preparations made to be rubbed into the skin for medicinal, cosmetic, or moistening purposes.
OJ (informal) abbreviation of "orange juice."