Ultratropical
(Ul`tra*trop"ic*al) a. [Pref. ultra- + tropical.] Situated beyond, or outside of, the tropics; extratropical; also,
having an excessively tropical temperature; warmer than the tropics.
Ultraviolet
(Ul`tra*vi"o*let) a. [Pref. ultra- + violet.] (Physics) Lying outside the visible spectrum at its
violet end; — said of rays more refrangible than the extreme violet rays of the spectrum.
Ultra vires
(||Ul`tra vi"res) [Law Latin, from L. prep. ultra beyond + vires, pl. of. vis strength.] Beyond
power; transcending authority; — a phrase used frequently in relation to acts or enactments by corporations
in excess of their chartered or statutory rights.
Ultrazodiacal
(Ul`tra*zo*di"a*cal) a. [Pref. ultra- + zodiacal.] (Astron.) Outside the zodiac; being in
that part of the heavens that is more than eight degrees from the ecliptic; as, ultrazodiacal planets, that
is, those planets which in part of their orbits go beyond the zodiac.
Ultroneous
(Ul*tro"ne*ous) a. [L. ultroneus, from ultro to the further side, on his part, of one's own
accord. See Ultra-.] Spontaneous; voluntary. [Obs.] Jer. Taylor. — Ul*tro"ne*ous*ly, adv. [Obs.] —
Ul*tro"ne*ous*ness, n. [Obs.]
Ulula
(||Ul"u*la) n. [L., a screech owl.] (Zoöl.) A genus of owls including the great gray owl (Ulula cinerea)
of Arctic America, and other similar species. See Illust. of Owl.
Ululant
(Ul"u*lant) a. Howling; wailing.
Ululate
(Ul"u*late) v. i. [imp. & p. p. Ululated ; p. pr. & vb. n. Ululating.] [L. ululatus, p. p. of ululare
to howl, yell, shriek.] To howl, as a dog or a wolf; to wail; as, ululating jackals. Sir T. Herbert.
Ululation
(Ul`u*la"tion) n. [L. ululatio.] A howling, as of a dog or wolf; a wailing.
He may fright others with his ululation.
Wither. Ulva
(||Ul"va) n. [L., sedge.] (Bot.) A genus of thin papery bright green seaweeds including the kinds
called sea lettuce.
Umbe
(Um"be) prep. [AS. ymbe; akin to OHG. umbi, G. um. Cf. Amb-.] About. [Obs.] Layamon.
Umbecast
(Um"be*cast`) v. i. [Umbe + cast.] To cast about; to consider; to ponder. [Obs.] Sir T.
Malory.
Umbel
(Um"bel) n. [L. umbella a little shadow, umbrella, dim. of umbra shade. See Umbrella.] (Bot.)
A kind of flower cluster in which the flower stalks radiate from a common point, as in the carrot and
milkweed. It is simple or compound; in the latter case, each peduncle bears another little umbel, called
umbellet, or umbellule.
Umbellar
(Um"bel*lar) a. (Bot.) Of or pertaining to an umbel; having the form of an umbel.
Umbellate
(Um"bel*late Um"bel*la`ted) a. [NL. umbellatus.] (Bot.) Bearing umbels; pertaining to an
umbel; umbel-like; as, umbellate plants or flowers.
Umbellet
(Um"bel*let) n. (Bot.) A small or partial umbel; an umbellule.
Umbellic
(Um*bel"lic) a. (Chem.) Pertaining to, or obtained from, certain umbelliferous plants; as, umbellic
acid.
Umbellic acid. (Chem.) (a) Anisic acid. [Obs.] (b) A yellow powder obtained from umbelliferone.
Umbellifer
(Um*bel"li*fer) n. [NL. See Umbelliferous.] (Bot.) A plant producing an umbel or umbels.
