a. [ See Ultra-. ] Going beyond others, or beyond due limit; extreme; fanatical; uncompromising; as, an ultra reformer; ultra measures. [ 1913 Webster ]

Ultra

n. One who advocates extreme measures; an ultraist; an extremist; a radical. Brougham. [ 1913 Webster ]

Ultra-

a. A prefix from the Latin ultra beyond (see Ulterior), having in composition the signification beyond, on the other side, chiefly when joined with words expressing relations of place; as, ultramarine, ultramontane, ultramundane, ultratropical, etc. In other relations it has the sense of excessively, exceedingly, beyond what is common, natural, right, or proper; as, ultraconservative; ultrademocratic, ultradespotic, ultraliberal, ultraradical, etc. [ 1913 Webster ]

Ultragaseous

a. [ Pref. ultra + gaseous. ] (Physics) Having the properties exhibited by gases under very low pressures (one millionth of an atmosphere or less). Matter under this condition, which has been termed the fourth state of matter, is sometimes called radiant matter. [ Webster 1913 Suppl. ]

Ultrage

n. Outrage. [ Obs. ] [ 1913 Webster ]

Ultraism

n. [ Cf. F. ultraïsme. See Ultra-. ] The principles of those who advocate extreme measures, as radical reform, and the like. Dr. H. More. [ 1913 Webster ]

Ultraist

n. One who pushes a principle or measure to extremes; an extremist; a radical; an ultra. [ 1913 Webster ]

Ultramarine

n. [ Cf. Sp. ultramarino. So called because the lapis lazuli was originally brought from beyond the sea, -- from Asia. ] (Chem.) A blue pigment formerly obtained by powdering lapis lazuli, but now produced in large quantities by fusing together silica, alumina, soda, and sulphur, thus forming a glass, colored blue by the sodium polysulphides made in the fusion. Also used adjectively. [ 1913 Webster ]

Green ultramarine, a green pigment obtained as a first product in the manufacture of ultramarine, into which it is changed by subsequent treatment. --
Ultramarine ash or
Ultramarine ashes (Paint.), a pigment which is the residuum of lapis lazuli after the ultramarine has been extracted. It was used by the old masters as a middle or neutral tint for flesh, skies, and draperies, being of a purer and tenderer gray than that produced by the mixture of more positive colors. Fairholt. [ 1913 Webster ]

Ultramarine

a. [ Pref. ultra- + marine. ] Situated or being beyond the sea. Burke. [ 1913 Webster ]

Ultramontane

a. [ LL. ultramontanus; L. ultra beyond + montanus belonging to a mountain, from mons, montis, mountain: cf. F. ultramontain, It. ultramontano. See Ultra-, and Mountain. ] Being beyond the mountains; specifically, being beyond the Alps, in respect to the one who speaks. [ 1913 Webster ]

☞ This term was first applied, somewhat contemptuously, by the Italians, to the nations north of the Alps, especially the Germans and French, their painters, jurists, etc. At a later period, the French and Germans applied it to the Italians. It is now more particularly used in respect to religious matters; and ultramontane doctrines, when spoken of north of the Alps, denote the extreme views of the pope's rights and supremacy maintained by Bellarmin and other Italian writers. [ 1913 Webster ]

WordNet (3.0) WordNet (3.0)

ultracentrifugation

(n) centrifugation at very high speeds

ultracentrifuge

(n) a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins

ultracentrifuge

(v) subject to the action of an ultracentrifuge

ultraconservative

(adj) extremely conservative

ultrahigh frequency

(n) 300 to 3000 megahertz, Syn. UHF

ultramarine