a. [ Pref. ultra- + violet. ] (Physics) Lying outside the visible spectrum at its blue-violet end; -- said of light more refrangible (i. e. having a shorter wavelength) than the extreme violet rays of the visible spectrum. Electromagnetic radiation with wavelengths shorter than those of ultrviolet light are not usually considered as light waves, but are classified differently. The ultraviolet region of the electromagnetic spectrum is generally considered as comprising those electromagnetic emissions with wavelengths lying between those of visible light and those of X-rays, i. e. between 4000 Angstroms and 100 Angstroms. [ 1913 Webster +PJC ]
n. [ F. violette a violet (cf. violet violet-colored), dim. of OF. viole a violet, L. viola; akin to Gr. &unr_;. Cf. Iodine. ]
☞ The cultivated sweet violet is Viola odorata of Europe. The common blue violet of the eastern United States is Viola cucullata; the sand, or bird-foot, violet is Viola pedata. [ 1913 Webster ]
[ 1913 Webster ]
Corn violet.
Dame's violet. (Bot.)
Dogtooth violet. (Bot.)
Water violet (Bot.),
a. [ Cf. F. violet. See Violet, n. ] Dark blue, inclining to red; bluish purple; having a color produced by red and blue combined. [ 1913 Webster ]
Violet shell (Zool.),
Violet wood,
n. Any tropical humming bird of the genus
n. (Zool.) A very handsome American butterfly (Polygonia interrogationis). Its wings are mottled with various shades of red and brown and have violet tips. [ 1913 Webster ]
(Bot.) See under Violet. [ 1913 Webster ]