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noun
1.
a long, narrow mark, smear, band of color, or the like:
streaks of mud.
2.
a portion or layer of something, distinguished by color or nature from the rest; a vein or stratum:
streaks of fat in meat.
3.
a vein, strain, or admixture of anything:
a streak of humor.
4.
Informal.

a spell or run:
a streak of good luck.
an uninterrupted series:
The team had a losing streak of ten games.

5.
a flash leaving a visible line or aftereffect, as of lightning; bolt.
6.
Mineralogy. the line of powder obtained by scratching a mineral or rubbing it upon a hard, rough white surface, often differing in color from the mineral in the mass, and serving as an important distinguishing character.
7.
Plant Pathology.

an elongated, narrow, superficial lesion on stems or leaf veins, becoming brown and necrotic.
any disease characterized by such lesions.

verb (used with object)
8.
to mark with a streak or streaks; form streaks on:
sunlight streaking the water with gold; frost streaking the windows.
9.
to lighten or color (strands of hair) for contrastive effect.
10.
to dispose, arrange, smear, spread, etc., in the form of a streak or streaks:
to streak cold germs on a slide for microscopic study.
verb (used without object)
11.
to become streaked.
12.
to run, go, or work rapidly.
13.
to flash, as lightning.
14.
to make a sudden dash in public while naked, especially as a prank.
Idioms
15.
blue streak. blue streak.
noun
1.
a long thin mark, stripe, or trace of some contrasting colour
2.

(of lightning) a sudden flash
(as modifier): streak lightning

3.
an element or trace, as of some quality or characteristic
4.
a strip, vein, or layer: fatty streaks
5.
a short stretch or run, esp of good or bad luck
6.
(mineralogy) the powdery mark made by a mineral when rubbed on a hard or rough surface: its colour is an important distinguishing characteristic
7.
(bacteriol) the inoculation of a solid culture medium by drawing a wire contaminated with the microorganisms across it
8.
(informal) an act or the practice of running naked through a public place
verb
9.
(transitive) to mark or daub with a streak or streaks
10.
(intransitive) to form streaks or become streaked
11.
(intransitive) to move rapidly in a straight line
12.
(intransitive) (informal) to run naked through a crowd of people in a public place in order to shock or amuse them
noun
1.
a variant spelling of strake (sense 2)

streak (strēk)
n.
A line, stripe, smear, or band differentiated by color or texture from its surroundings.
streak
(strēk)

The characteristic color of a mineral after it has been ground into a powder. Because the streak of a mineral is not always the same as its natural color, it is a useful tool in mineral identification.

A bacterial culture inoculated by drawing a bacteria-laden needle across the surface of a solid culture medium. Also called streak plate.

Any of various viral diseases of plants characterized by the appearance of discolored stripes on the leaves or stems.

streak