…(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…
…sound waves with frequencies below the lower limit of human audibility…
…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…
