| OLDEN | • olden adj. From or relating to a previous era. • olden adj. (Archaic) Old; ancient. • olden v. (Intransitive, old-fashioned or rare) To grow old; age; assume an older appearance or character; become… | 
| OLDER | • older adj. Comparative form of old: more old, elder, senior. • older adj. Elderly. • Older prop.n. A surname. | 
| OLDIE | • oldie n. (Informal) Something or someone old. • oldie n. (Informal) A song or record from a previous era. • oldie n. (Informal, in the plural) The genre of music composed of popular music from previous eras. | 
| OLEIC | • oleic adj. Of or pertaining to oil, especially to vegetable oil. • oleic adj. (Chemistry) Of or pertaining to oleic acid or its derivatives. • OLEIC adj. pertaining to or derived from oil. | 
| OLEIN | • olein n. Any naturally-occurring greasy or oily substance related to fat. • olein n. (Chemistry) Any glyceride of oleic acid. • OLEIN n. a glycerine ester of oleic acid, also OLEINE. | 
| OLENT | • olent adj. (Obsolete) scented. • OLENT adj. having a smell. | 
| OLEOS | • oleos n. Plural of oleo. • OLEO n. (short for) oleograph, a lithographic reproduction of an oil painting. | 
| OLEUM | • oleum n. (Inorganic chemistry) A solution of sulfur trioxide in sulfuric acid. • OLEUM n. (Latin) fuming sulphuric acid. | 
| OLIOS | • olios n. Plural of olio. • Olios prop.n. A taxonomic genus within the family Sparassidae – many huntsman spiders. • OLIO n. a savoury dish of meat and vegetables. | 
| OLIVE | • olive n. A tree, Olea europaea, cultivated since ancient times in the Mediterranean for its fruit and the oil obtained from it. • olive n. The small oval fruit of this tree, eaten ripe (usually black) or unripe (usually green). • olive n. The wood of the olive tree. | 
| OLLAS | • ollas n. Plural of olla. • OLLA n. (Spanish) a jar or urn with a wide mouth. | 
| OLLAV | • ollav n. Alternative form of ollamh. • OLLAV n. (Irish) an Irish master poet, also OLLAMH. | 
| OLLER | • Oller prop.n. A surname. • OLLER n. (dialect) waste ground. | 
| OLLIE | • ollie n. (Skateboarding, surfing, snowboarding) An aerial maneuver in which one catches air by leaping off the… • ollie v. (Intransitive) To perform an ollie. • Ollie prop.n. A diminutive of the male given name Oliver. | 
| OLOGY | • ology n. (Colloquial) Any branch of learning, especially one ending in “-logy”. • -ology suff. Alternative form of -logy, used for phonological reasons when the preceding morpheme ends in certain consonant sounds. • -ology suff. (Often humorous) added to an ordinary English word to create a name for a (possibly non-existent) field of study. | 
| OLPAE | • olpae n. Plural of olpe. • OLPE n. (Greek) a Greek jug. | 
| OLPES | • olpes n. Plural of olpe. • OLPE n. (Greek) a Greek jug. |