From Longman Dictionary of Contemporary Englishstrainerstrain‧er /ˈstreɪnə $ -ər/ noun [countable] 
DFUa kitchen tool with lots of small holes in it, that is used for separating solids from liquids → sieve a tea strainer
DFUa kitchen tool with lots of small holes in it, that is used for separating solids from liquids → sieve a tea strainerExamples from the Corpus
strainer• Drain in a strainer, rinse and remove root ends.• Turn down and pour the milk through a strainer into a bowl.• Sieve the mixture through a fine strainer and pour into a freezer-proof dish.• Strain the stock through a fine strainer or sieve.• Drain in strainer and immediately plunge beans into ice water.• Strain custard through fine-mesh strainer into second large mixing bowl.• Carefully leaving behind any dirt that has settled, pour water through fine-mesh strainer into 4-cup liquid measuring cup.• Chances are, not filter-cleaning, but attention to your pump strainer. 