/ ˈsæʃeɪ; NAmE sæˈʃeɪ/ noun
1.
( BrE ) ( NAmE packet ) a closed plastic or paper package that contains a very small amount of liquid or a powder :
a sachet of sauce / sugar / shampoo
2.
a small bag containing dried herbs or flowers that you put with your clothes to make them smell pleasant
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WORD ORIGIN
mid 19th cent. (in sense 2): from French , little bag , diminutive of sac , from Latin saccus sack, bag.