opacifier - v.tr. & intr. (-ies, -ied) make or become opaque. opacifier n.... [more]

opacify - v.tr. & intr. (-ies, -ied) make or become opaque. opacifier n.... [more]

opacity - n. 1 the state of being opaque. 2 obscurity of meaning. 3 obtuseness of understanding.... [more]

opah - n. a large rare deep-sea fish, Lampris guttatus, usu. having a silver-blue back... [more]

opalescence - adj. showing changing colours like an opal. opalesce v.intr. opalescence n.... [more]

opalescent - adj. showing changing colours like an opal. opalesce v.intr. opalescence n.... [more]

opaline - adj. & n. opal-like, opalescent, iridescent. opal glass. ... [more]

opaquely - spelling now assim. to F]... [more]

opaqueness - spelling now assim. to F]... [more]

openable - adj., v., & n. 1 not closed or locked or blocked up; allowing entrance or passage... [more]

openly - adv. 1 frankly, honestly. 2 publicly; without concealment. [OE openlice (as OPEN,... [more]

openness - adj., v., & n. 1 not closed or locked or blocked up; allowing entrance or passage... [more]

openwork - n. a pattern with intervening spaces in metal, leather, lace, etc. ... [more]

operability - adj. 1 that can be operated. 2 suitable for treatment by surgical operation. operability... [more]

operable - adj. 1 that can be operated. 2 suitable for treatment by surgical operation. operability... [more]

operatic - adj. 1 of or relating to opera. 2 resembling or characteristic of opera. operatically... [more]

operatically - adj. 1 of or relating to opera. 2 resembling or characteristic of opera. operatically... [more]

operatics - n.pl. the production and performance of operas. ... [more]

operationally - adj. 1 a of or used for operations. b engaged or involved in operations. 2 able... [more]

operatively - adj. & n. 1 in operation; having effect. 2 having the principal relevance ('may'... [more]

operativeness - adj. & n. 1 in operation; having effect. 2 having the principal relevance ('may'... [more]

opercular - n. (pl. opercula) 1 Zool. a a flaplike structure covering the gills in a fish. b... [more]

operculate - n. (pl. opercula) 1 Zool. a a flaplike structure covering the gills in a fish. b... [more]

operetta - see OPERA]... [more]

ophthalmia - n. an inflammation of the eye, esp. conjunctivitis. [LL f. Gk f. ophthalmos eye]... [more]

ophthalmological - n. the scientific study of the eye. ophthalmological adj. ophthalmologist n.... [more]

ophthalmologist - n. the scientific study of the eye. ophthalmological adj. ophthalmologist n.... [more]

ophthalmoscope - n. an instrument for inspecting the retina and other parts of the eye. ophthalmoscopic... [more]

ophthalmoscopic - n. an instrument for inspecting the retina and other parts of the eye. ophthalmoscopic... [more]

opiate - see OPIUM]... [more]

opine - v.tr. (often foll. by that + clause) hold or express as an opinion. [L opinari... [more]

opinion - adj. 1 stubbornly adhering to one's own opinions. 2 arrogant. self-opinion n.... [more]

opopanax - n. 1 a an umbelliferous plant, Opopanax chironium, with yellow flowers. b a resinous... [more]

oppo - n. (pl. -os) Brit. colloq. a colleague or friend. [opposite number]... [more]

opponency - n. & adj. a person who opposes or belongs to an opposing... [more]

opportune - adj. 1 (of a time) well-chosen or especially favourable or appropriate (an opportune... [more]

opportunely - adj. 1 (of a time) well-chosen or especially favourable or appropriate (an opportune... [more]

opportuneness - adj. 1 (of a time) well-chosen or especially favourable or appropriate (an opportune... [more]

opportunism - n. 1 the adaptation of policy or judgement to circumstances or opportunity, [more]

opportunist - n. 1 the adaptation of policy or judgement to circumstances or opportunity, [more]

opportunistic - n. 1 the adaptation of policy or judgement to circumstances or opportunity, [more]

opportunistically - n. 1 the adaptation of policy or judgement to circumstances or opportunity, [more]

opposable - adj. 1 able to be opposed. 2 Zool. (of the thumb ... [more]

oppose - see OPPONENT]... [more]

opposer - see OPPONENT]... [more]

oppositely - see OPPONENT]... [more]

oppositeness - see OPPONENT]... [more]

oppositional - n. 1 resistance , antagonism. 2 the state of... [more]

oppressively - adj. 1 oppressing; harsh or cruel . 2 difficult to... [more]

oppressiveness - adj. 1 oppressing; harsh or cruel . 2 difficult to... [more]

oppressor - v.tr. 1 keep in subservience by coercion. 2 govern... [more]

opprobrious - adj. (of language) severely scornful; abusive. opprobriously adv. [ME f. LL opprobriosus... [more]

opprobriously - adj. (of language) severely scornful; abusive. opprobriously adv. [ME f. LL opprobriosus... [more]

opprobrium - n. 1 disgrace or bad reputation attaching to some act or conduct .... [more]

oppugn - v.tr. literary call into question; controvert. oppugner n. [ME f. L oppugnare... [more]

oppugnance - adj. formal attacking; opposing. oppugnance n. oppugnancy n. oppugnation n.... [more]

oppugnancy - adj. formal attacking; opposing. oppugnance n. oppugnancy n. oppugnation n.... [more]

oppugnant - adj. formal attacking; opposing. oppugnance n. oppugnancy n. oppugnation n.... [more]

oppugnation - adj. formal attacking; opposing. oppugnance n. oppugnancy n. oppugnation n.... [more]

oppugner - v.tr. literary call into question; controvert. oppugner n. [ME f. L oppugnare... [more]

opsimath - n. literary a person who learns only late in life. opsimathy n. [Gk opsimathes... [more]

opsimathy - n. literary a person who learns only late in life. opsimathy n. [Gk opsimathes... [more]

opsonic - n. an antibody which assists the action of phagocytes. opsonic adj. [Gk opsonion... [more]

opsonin - n. an antibody which assists the action of phagocytes. opsonic adj. [Gk opsonion... [more]

opt - v.intr. (usu. foll. by for, between) exercise an option; make ... [more]

optant - n. 1 a person who may choose one of two nationalities. 2 a person who chooses or... [more]

optation - v.tr. appoint to membership of a body by invitation ... [more]

optative - adj. & n. Gram. expressing a wish. the optative mood. optative mood a [more]

optatively - adj. & n. Gram. expressing a wish. the optative mood. optative mood a [more]

optically - adj. 1 of sight; visual. 2 a of or concerning sight or light in relation to [more]