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

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

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 ]

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. ]

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

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 ]

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

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

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 ]

n. 1. One who resides beyond the mountains, especially beyond the Alps; a foreigner. [ 1913 Webster ]

2. One who maintains extreme views favoring the pope's supremacy. See Ultramontanism. [ 1913 Webster ]