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

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

Those who are tested will be sent a finger prick to illicit a small sample of blood, which is then stored on a special filter paper.

From Fox News • May 6, 2020

From the difference in weight of the gooch or filter paper and the dried residue remaining thereon after filtering and drying, the total percentage of insoluble matter may easily be calculated.

From Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. by Thomssen, E. G.