What is the meaning of Strainer?

A device through which a liquid is passed for purification, filtering or separation from solid matter; anything (including a screen or a cloth) used to strain a liquid.

A perforated screen or openwork (usually at the end of a suction pipe of a pump), used to prevent solid bodies from mixing in a liquid stream or flowline.

Debris in water that blocks the passage of solid objects.

One who strains.

Source: wiktionary.org