The Collaborative International Dictionary
Filter \Fil"ter\, v. t. [imp. & p. p. Filtered; p. pr. & vb. n. Filtering] [Cf. F. filter. See Filter, n., and cf. Filtrate.] To purify or defecate, as water or other liquid, by causing it to pass through a filter.
Filtering paper, or Filter paper, a porous unsized paper, for filtering.
Wiktionary
n. porous paper used for filtration, typically in a filter funnel
WordNet
n. a porous unsized paper used for filtering
Wikipedia
Filter paper is a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine substances from liquids or air.
Usage examples of "filter paper".
Many require straining, which can be done through old pantyhose or coffee filter paper.
A strip of filter paper, wetted with the active culture and in a stoppered bottle with a trace of swamp fluid, that showed the active culture stopped dead.
She took the swabs from the test tubes I'd sent up to her, moistened them with water and smeared filter paper with them.
When his laborant thought the reaction was complete, he selected a piece of filter paper from a drawer, folded it, and placed it into a funnel.
Gribbleflotz approved of his actions, he then opened the folds of the filter paper to expose the precipitate.
He jabbed at the back of her finger with a needle, squeezed out a drop of blood, adsorbed it on a sheet of filter paper and placed it in a labelled envelope.
Edward unscrewed the lid and carefully spread the dark, ricelike grains onto a piece of filter paper as if they were gold nuggets.
After blood and dirt were gently agitated free, the solution was strained through sterile filter paper and each fiber was mounted on a glass slide.
You first lay a piece of filter paper over the holes and then put in the pulverized coffee, which Dingle grinds fresh every morning.
I dumped the Columbian fine grind into the Benz filter paper and slid into the booth.