filter پالایه pâlâyé (#) Fr.: filtre General: A device for separating the constituents of a system according to
a physical property. In particular, a device for removing solid matter suspended
in a liquid by forcing the suspension through a material which retains the solid
matter while allowing the liquid to pass.
Optics: A device for transmitting electromagnetic radiation with restricted ranges
of wavelength. Two types are generally used, → glass filters and
→ interference filters. See also
→ neutral density filter.
Electronics: A circuit or equipment allowing the transmission of desired
frequencies and the elimination of others.
Etymology (EN): From M.L. filtrum “felt,” which was used to strain impurities from liquid,
from W.Gmc. *filtiz. Etymology (PE): Pâlâyé, from pâlây present stem of pâludan “to filter, purify;”
Mid.Pers. pâludan, pâlây- “to strain, filter, purify,” from Proto-Iranian
*pari-harz-, from prefix *pari- “around,” → peri-, - harz- “to let go, release;” cf. Av. pairi.harəz- “to filter,”
from pairi-
“around, over” (cf. Skt. pari; Gk. peri “around, about, beyond;”
L. per “through;” PIE base *per- “through, across, beyond”)
- harəz- “to release” (especially water,
liquid; cf. Chorasmian pžy- “to purify, filter;” Arm. (loanword)
parzel “to filter, purify;”
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