Webster's English Dictionary

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streak

1. streak \'stre-k\ n [ME streke, fr. OE strica; akin to OHG strich line, L 
   stri]ga row - more at STRIKE 1: a line or mark of a different color or 
   texture from the ground : ST RIPE 2a: the color of the fine powder of a 
   mineral obtained by scratching or rub bing against a hard white surface and 
   constituting an important distinguishing character 2b: inoculum implanted 
   in a line on a solid medium  3a: a narrow band of light  3b: a lightning 
   bolt  4a: a slight admixture : TRACE  4b: a brief run (as of luck)  4c: a 
   consecutive series {winning ~}  5: a narrow layer (as of ore) 
2. streak vt : to make streaks on or in : STRIATE to move swiftly : RUSH)M