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Lying under or beneath; hence, fundamental; as, the underlying strata of a locality; underlying principles.

To excavate the earth beneath, or the part of, especially for the purpose of causing to fall or be overthrown; to form a mine under; to sap; as, to undermine a wall. A vast rock undermined from one end to the other, and a highway running through it. Addison.

Beneath; below; in a lower place; under; as, a channel underneath the soil. Or sullen mole, that runneth underneath. Milton.

ich a building is underpinned; the material and construction used for support, introduced beneath a wall already constructed.

To prop from beneath; to put a prop under; to support; to uphold. Underprop the head that bears the crown. Fenton.

Moved by water passing beneath; -- said of a water wheel, and opposed to overshot; as, an undershot wheel.

Closed from beneath. Undershut valve (Mach.), a valve which shuts by being lifted against a seat facing downward. Knight.

The soil beneath the surface; understratum; subsoil.

To destroy by an explosion from beneath. (c) To explode; as, the boiler blew up. (d) To reprove angrily; to scold. [Slang] -- To bring up. See under Bring, v. t. -- To come up with. See under Come, v. i. -- To cut up. See under Cut, v. t. & i. -- To draw up. See under Draw, v. t. -- To grow up, to grow to maturity.…

To heave or lift up from beneath; to raise. Milton.

Usurpation. [R.] "Beneath man's usurpature." R. Browning.

f what one is, or has, or has done; ostentation from vanity; a boast; a brag. The spirits beneath, whom I seduced With other promises and other vaunts. Milton.

The circular membrane that partially incloses the space beneath the umbrella of hydroid medusæ.

rsal. Ventral fins (Zoöl.), the posterior pair of fins of a fish. They are often situated beneath the belly, but sometimes beneath the throat. -- Ventral segment. (Acoustics) See Loop, n., 5.

uch larger. Its fur is soft and rather long, mottled gray above, white or yellowish white beneath. There is a white band across the muzzle, and a dark band on each cheek. It inhabits grassy plains, and is noted for its extensive burrows and for heaping up miscellaneous articles at the mouth of its burrows. Called also…

nic eruptions. -- Volcanic foci, the subterranean centers of volcanic action; the points beneath volcanoes where the causes producing volcanic phenomena are most active. -- Volcanic glass, the vitreous form of lava, produced by sudden cooling; obsidian. See Obsidian. -- Volcanic mud, fetid, sulphurous mud discharged…

A bone, or one of a pair of bones, beneath the ethmoid region of the skull, forming a part a part of the partition between the nostrils in man and other mammals.

nd claw longer and straighter, than do the water wagtails. Most of the species are yellow beneath. Called also yellow wagtail. -- Garden wagtail, the Indian black-breasted wagtail (Nemoricola Indica). -- Pied wagtail, the common European water wagtail (Motacilla lugubris). It is variegated with black and white. The n…

hese birds live about the water, and are in the habit of walking on the bottom of streams beneath the water in search of food.

An aquatic European spider (Argyoneta aquatica) which constructs its web beneath the surface of the water on water plants. It lives in a bell-shaped structure of silk, open beneath like a diving bell, and filled with air which the spider carries down in the form of small bubbles attached one at a time to the spinnerets…