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. 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.

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.

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.

15. blue streak.

1. a long thin mark, stripe, or trace of some contrasting colour
• (of lightning) a sudden flash
• (as modifier)
3. an element or trace, as of some quality or characteristic
4. a strip, vein, or layer
5. a short stretch or run, esp of good or bad luck
6. the powdery mark made by a mineral when rubbed on a hard or rough surface: its colour is an important distinguishing characteristic
7. the inoculation of a solid culture medium by drawing a wire contaminated with the microorganisms across it
8. an act or the practice of running naked through a public place

9. to mark or daub with a streak or streaks
10. to form streaks or become streaked
11. to move rapidly in a straight line
12. to run naked through a crowd of people in a public place in order to shock or amuse them

1. a variant spelling of strake (def. 2)

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