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on·yx noun [ORIGIN: ME oniche, onyx, fr. AF & L; AF, fr. L onyx, fr. Gk, lit., claw, nail]

: a translucent chalcedony in parallel layers of different colors

oo·dles noun plural : a great quantity : LOT

oo·lite noun : a rock consisting of small round grains cemented together

— oo·lit·ic adjective

1ooze noun [ORIGIN: ME wose, fr. OE wāse mire]

1 : a soft deposit (as of mud) on the bottom of a body of water

2 : soft wet ground : MUD

Synonyms

mire, muck, mud, slime, slop, sludge, slush—more at MUD

2ooze verb oozed; ooz·ing 1 : to flow or leak out slowly or imperceptibly

2 : EXUDE

Synonyms

[1, 2] bleed, exude, percolate, seep, strain, sweat, weep—more at EXUDE

3ooze noun : something that oozes

oozy adjective : containing or composed of ooze

Synonyms

miry, mucky, muddy, slimy, slushy—more at MUDDY

op abbreviation 1 operation; operative; operator

2 opportunity

3 opus

OP abbreviation 1 observation post

2 out of print

opac·i·ty noun, plural -ties 1 : the quality or state of being opaque

2 : obscurity of meaning

3 : mental dullness

4 : an opaque spot in a normally transparent structure

Synonyms

ambiguity, darkness, murkiness, obscurity—more at OBSCURITY

opal noun : a mineral with iridescent colors that is used as a gem

opal·es·cent adjective : IRIDESCENT

— opal·es·cence noun

opaque adjective 1 : blocking the passage of radiant energy and esp. light

2 : not easily understood

3 : OBTUSE

— opaque·ly adverb

— opaque·ness noun

Synonyms

bleary, dim, faint, foggy, fuzzy, hazy, indefinite, indistinct, indistinguishable, murky, nebulous, obscure, shadowy, unclear, undefined, undetermined, vague—more at FAINT

op art noun : OPTICAL ART

— op artist noun

op cit abbreviation [ORIGIN: L opere citato]

in the work cited

ope verb oped; op·ing archaic

: OPEN

OPEC abbreviation Organization of Petroleum Exporting Countries

op–ed noun, often cap O&E : a page of special features usu. opposite the editorial page of a newspaper

1open adjective open·er; open·est 1 : not shut or shut up

2 a : not secret or hidden

b : free from reserve or pretense : FRANK

3 a : not enclosed or covered

b : not protected or covered

4 : free to be entered or used

5 : easy to get through or see <~ country>

6 : spread out : EXTENDED

7 : not decided

8 a : readily accessible and cooperative; also : GENEROUS

b : willing to hear and consider or to accept and deal with

9 : having components separated by a space in writing and printing

10 : having openings, interruptions, or spaces

11 : ready to operate

12 : free from restraints or controls <~ season>

— open·ly adverb

Synonyms

[2b] candid, direct, forthright, foursquare, frank, honest, outspoken, plain, straight, straightforward, unguarded, unreserved—more at FRANK

[3b] bald, bare, exposed, naked, uncovered—more at NAKED

[4] free-for-all, public, unrestricted; also collective, common, communal, shared; accessible, available, free; unregulated

Antonyms

closed, exclusive, private, restricted

[5] clear, free, unobstructed; also emptied, unoccupied, vacant; exposed, revealed; gaping, wide, yawning; unbolted, unclasped, unfastened, unlatched, unsealed; unbuttoned, unclenched, unfolded, unfurled

Antonyms

blocked, closed, obstructed, uncleared

[7] pending, undecided, undetermined, unresolved, unsettled—more at PENDING

2open verb opened; open·ing 1 a : to change or move from a shut position

b : to make open by clearing away obstacles

2 : to make accessible

3 : to make openings in

4 : to make or become functional <~ a store>

5 : REVEAL; also : ENLIGHTEN

6 : to enter upon : BEGIN

— open·er noun

Synonyms

[1b] clear, free, unblock

[6] begin, commence, embark, enter, get off, launch, start, strike—more at BEGIN

3open noun 1 : open and unobstructed space : OUTDOORS

2 : a contest or tournament open to all

Synonyms