filtré

Filtré is the past participle of the French verb filtrer and functions as an adjective describing something that has undergone a filtration process. In ordinary usage, it denotes that solids have been removed or reduced by passage through a filter, yielding a clearer or purer product. The masculine form filtré and the feminine form filtrée agree with the noun they modify.

Common applications include beverages, water, and air. Examples include eau filtrée (filtered water) and café filtré (filter coffee), where filtration is the primary method to separate particles or residues. In scientific and industrial contexts, filtré describes liquids or gases that have passed through a filtration step, a distinction often used to compare unfiltered versus filtré streams in chemistry, environmental science, and process engineering.

In signal processing and computing, filtré can describe a signal that has been processed by a filter to remove unwanted components or noise, resulting in a smoother or more relevant output. The term is widely understood in French-speaking technical domains and is used alongside related terms such as filtre (filter) and filtration (filtration).

Etymology traces filtré to filtrer, from Latin filtrare, meaning to strain or to pass through a filter. Grammatical forms include filtré (masculine) and filtrée (feminine); the participle agrees with the modified noun.

See also: filtration, filter, coffee filter, filtered water, filtered signals.