Obturbinate, ob-tur′bi-nāt, adj. inversely top-shaped.
Obtuse, ob-tūs′, adj. blunt: not pointed: (bot.) blunt or rounded at the point, as a leaf: stupid: not shrill: (geom.) greater than a right angle.—adjs. Obtuse′-ang′led, Obtuse′-ang′ular, having an angle greater than a right angle.—adv. Obtuse′ly.—ns. Obtuse′ness, Obtus′ity. [Fr.,—L. obtusus—obtundĕre, to blunt—ob, against, tundĕre, to beat.]
Obumbrate, ob-um′brāt, v.t. to overshadow, to darken.—adj. lying under some projecting part, as the abdomen of certain spiders.—adj. Obum′brant, overhanging. [L. obumbrāre, -ātum, to overshadow.]
Obvallate, ob-val′āt, adj. walled up. [L. obvallāre, -ātum, to wall round.]
Obvelation, ob-vē-lā′shun, n. concealment.
Obvention, ob-ven′shun, n. (obs.) any incidental occurrence, or advantage, esp. an offering.
Obverse, ob-vėrs′, adj. turned towards one: bearing the head, as one face of a coin—opp. to Reverse: a second or complemental aspect of the same fact, a correlative proposition identically, implying another: (bot.) having the base narrower than the top.—n. Ob′verse, the side of a coin containing the head, or principal symbol.—adv. Obverse′ly.—n. Obver′sion, the act of turning toward the front of anything: in logic, a species of immediate inference—viz. the predicating of the original subject, the contradictory of the original predicate, and changing the quality of the proposition—e.g. to infer from all A is B that no A is not B—also called Permutation and Equipollence.—v.t. Obvert′, to turn towards the front. [L. obversus—ob, towards, vertĕre, to turn.]
Obviate, ob′vi-āt, v.t. to meet on the way, hence to remove, as difficulties. [L. obviāre, -ātum—ob, in the way of, viāre, viātum, to go—via, a way.]
Obvious, ob′vi-us, adj. meeting one in the way: easily discovered or understood: evident.—adv. Ob′viously.—n. Ob′viousness. [L. obvius.]
Obvolute, -d, ob′vo-lūt, -ed, adj. rolled or turned in, as two leaves in a bud, one edge of each out and the other in, as in the poppy.—adj. Obvol′vent, curved downward or inward. [L. obvolutus—ob, before, volvĕre, volutum, to roll.]