English dictionary: words starting with op

noun

A surgical operation.

Usage examples:

A minor op

prefix

Variant spelling of ob- assimilated before p (as in oppress, oppugn ).

abbreviation

Observation post.

noun

Originally among german and dutch communities: a grandfather.

verb

Opacify.

verb

Make or become opaque.

Usage examples:

Milk-glass opacified with arsenic displays a fiery opalescence

verb

Make or become opaque.

Usage examples:

Milk-glass opacified with arsenic displays a fiery opalescence

verb

Make or become opaque.

Usage examples:

Milk-glass opacified with arsenic displays a fiery opalescence

verb

Make or become opaque.

Usage examples:

Milk-glass opacified with arsenic displays a fiery opalescence

noun

An instrument for measuring the opacity of a body or substance, especially by measuring the amount of light it reflects.

noun

Microscopic dark grains and scales occurring in the groundmass of many igneous rocks, which are too small to be readily identified by optical means and are sometimes attributed to iron oxides or carbon.

noun

The quality of lacking transparency or translucence.

Usage examples:

Thinner paints need black added to increase opacity

noun

A large deep-bodied fish with a deep blue back, silvery belly, and crimson fins, which lives in deep oceanic waters.

Usage examples:

One fish i wish i could see with my own eyes is the brilliant opah, or moonfish.

noun

A large deep-bodied fish with a deep blue back, silvery belly, and crimson fins, which lives in deep oceanic waters.

Usage examples:

One fish i wish i could see with my own eyes is the brilliant opah, or moonfish.

noun

A gemstone consisting of a form of hydrated silica, typically semi-transparent and showing many small points of shifting colour against a pale or dark ground.

Usage examples:

A large opal surrounded by small diamonds

noun

The quality of reflecting light and changing colour like an opal

Usage examples:

The milky opalescence of the northern sea, the hedge rose against the pale opalescence of the lower…

adjective

Showing many small points of shifting colour against a pale or dark ground.

Usage examples:

An opalescent sky

adjective

Resembling an opal in colour or iridescence; opalescent.

noun

A deep-bodied percoid fish, girella nigricans (family kyphosidae), having a green back and iridescent blue eyes and native to the coastal waters of southern california.

adjective

Opalescent.

Usage examples:

Sponges have an internal skeleton composed of needle-like elements called spicules, which can be co…

noun

Another term for milk-glass.

noun

A protozoan of the group opalinata, which comprises ciliated organisms parasitic in the intestines of lower vertebrates, especially frogs and toads.

adjective

Of or relating to the opalinids.

adjective

Somewhat like opal in appearance.

verb

To make iridescent like an opal; to make opaline or opalescent.

adjective

(especially of a fossil) converted into opal, or a substance resembling opal; rendered opalescent.

verb

To make iridescent like an opal; to make opaline or opalescent.

noun

A gemstone consisting of a form of hydrated silica, typically semi-transparent and showing many small points of shifting colour against a pale or dark ground.

Usage examples:

A large opal surrounded by small diamonds

adjective

Not able to be seen through; not transparent.

Usage examples:

Bottles filled with a pale opaque liquid

noun

An opaque thing.

Usage examples:

To be honest, it's a relief when summer is over and we can get back into good old black opaques, wh…