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infra British & World English

(In a written document) below; further on

infra dig British & World English

Beneath one; demeaning

infrared British & World English

(Of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects

infrasound British & World English

Sound waves with frequencies below the lower limit of human audibility

infraspecific British & World English

At a taxonomic level below that of species, e.g. subspecies, variety, cultivar, or form. In botany, Latin names at this level usually require the addition of a term denoting the rank

infrared sensor British & World English

A device which can detect motion by receiving infrared radiation

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