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| NORTHNORTHWEST | | n. Point or direction midway between north and north-west. | |
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| OPHTHALMOSCOPE | | n. Instrument for examining the eye. | |
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| OSTEOARTHRITIS | | n. Degenerative disease of joint cartilage. osteoarthritic adj. | |
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| OVERCOMPENSATE | | v. (-ting) 1 (usu. Foll. By for) compensate excessively.
- strive exaggeratedly to make amends etc. | |
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| OVERENTHUSIASM | | n. Excessive enthusiasm. overenthusiastic adj. Overenthusiastically adv. | |
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| OVERPARTICULAR | | adj. Excessively particular or fussy. | |
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| OVERPROTECTIVE | | adj. Excessively protective. | |
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| OVERSPECIALIZE | | v. (also -ise) (-zing or -sing) concentrate too much on one aspect or area. overspecialization n. | |
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| PARALLELEPIPED | | n. Solid body of which each face is a parallelogram. [greek: related to *parallel, epipedon plane surface] | |
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| PARAPSYCHOLOGY | | n. The study of mental phenomena outside the sphere of ordinary psychology (hypnosis, telepathy, etc.). | |
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