tupperware

CIDE DICTIONARY

tupperware, n. [Trade name.].

 the collective trade name for a type of plastic food-storage container with a translucent bottom and a close-fitting lid designed to seal the container tightly. It is in common use in the late 20th century and early 21st century in the U. S. It comes in a variety of shapes and sizes, suitable for storing a variety of items. Also used attributively.  [PJC]

OXFORD DICTIONARY

tupperware, n. propr. a range of plastic containers for storing food.

Etymology

Tupper, name of the US manufacturer, + WARE(1)