wash bottle

wash bottle
: a bottle or flask provided with one bent tube passing through the stopper for directing a stream of water on anything to be washed or rinsed and with means for forcing (as by blowing into a second tube passing through the stopper or by squeezing if the bottle is flexible) the water through the tube

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wash bottle,
a glass flask having a stopper that is perforated by tubes, arranged so that by blowing in one tube the water or other liquid in the flask may be forced out in a small stream through another tube: »

Wash bottles are used in laboratories, for washing precipitates on filters.

Useful english dictionary. 2012.