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To have just and adequate ideas of; to apprehended the meaning or intention of; to have knowledge of; to comprehend; to know; as, to understand a problem in Euclid; to understand a proposition or a declaration; the court understands the advocate or his argument; to understand the sacred oracles; to understand a nod or…

Not adequate or sufficient; inferior; as, the man was unequal to the emergency; the timber was unequal to the sudden strain.

A European aquatic toad (Bombinator igneus). Its back is dark; its belly is marked with crimson. Called also feuerkröte.

Not speakable; incapable of being uttered or adequately described; inexpressible; unutterable; ineffable; as, unspeakable grief or rage. -- Un*speak"a*bly, adv. Ye rejoice with joy unspeakable and full of glory. 1 Pet. i. 8.

To; -- now used only in antiquated, formal, or scriptural style. See To.

A genus of aquatic flowering plants, in which the submersed leaves bear many little utricles, or ascidia. See Ascidium,

of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.

A formal phrase used in concluding a plea. Verification of an equation (Math.), the operation of testing the equation of a problem, to see whether it expresses truly the conditions of the problem. Davies & Peck. (Math. Dict.)

The turning factor of a quaternion.

A genus of aquatic plants named in honor of Queen Victoria. The Victoria regia is a native of Guiana and Brazil. Its large, spreading leaves are often over five feet in diameter, and have a rim from three to five inches high; its immense rose-white flowers sometimes attain a diameter of nearly two feet.…

the summary suppression and punishment of crime, as when the processes of law appear inadequate.

Active quality or power; capacity or power adequate to the production of a given effect; energy; strength; potency; efficacy; as, the virtue of a medicine. Jesus, immediately knowing in himself that virtue had gone out of him, turned him about. Mark v. 30. A man was driven to depend for his security against misundersta…

Any one of numerous species of aquatic beetles belonging to Dytiscus and allied genera of the family Dytiscidæ, and to various genera of the family Hydrophilidæ. These beetles swim with great agility, the fringed hind legs acting together like oars.

Any aquatic bird; a water fowl.

Any one of numerous species of large, rapacious, aquatic, hemipterous insects belonging to Belostoma, Benacus, Zaitha, and other genera of the family Belostomatidæ. Their hind legs are long and fringed, and act like oars. Some of these insects are of great size, being among the largest existing Hemiptera. Many of them…

A large West African chevrotain (Hyæmoschus aquaticus). It has a larger body and shorter legs than the other allied species. Called also water deerlet.

An aquatic kind of buttercup (Ranunculus aquatilis), used as food for cattle in parts of England. Great water crowfoot, an American water plant (Ranunculus multifidus), having deep yellow flowers.

Any one of numerous species of small aquatic Entomostraca belonging to the genera Cyclops, Daphnia, etc; -- so called because they swim with sudden leaps, or starts.

A small American hare or rabbit (Lepus aquaticus) found on or near the southern coasts of the United States; -- called also water rabbit, and swamp hare.

Either of several tropical aquatic plants of the genus Eichhornia, related to the pickerel weed.