filter paper

American  

noun

1. porous paper used in filtering.

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filter paper British  

noun

1. a porous paper used for filtering liquids

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Etymology

Origin of filter paper

First recorded in 1890–95

Example Sentences

They also collected urine samples on filter paper to measure estrogen and progesterone, allowing them to identify when ovulation occurred.

From Science Daily • Dec. 14, 2025

Blood obtained by pricking a baby’s heel was collected on filter paper and tested for phenylketonuria, a rare metabolic condition that, if untreated, causes intellectual disability.

From Scientific American • Nov. 13, 2023

This involves placing a piece of filter paper for 60 seconds between a dog’s lower eyelid and cornea.

From New York Times • Aug. 22, 2022

The scientists wiped the armpits of healthy people and dengue fever patients with an absorbent material, isolated the molecules that could become airborne, and dabbed them onto filter paper.

From Science Magazine • Jun. 30, 2022

Without washing, transfer the film to a watch-glass containing the reducing solution and allow it to remain therein for from thirty seconds to one minute; blot off the excess of fluid with filter paper.

From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by Eyre, J. W. H. (John William Henry)