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isson (Engin.), a caisson, closed at the top but open at the bottom, and resting upon the ground under water. The pressure of air forced into the caisson keeps the water out. Men and materials are admitted to the interior through an air lock. See Lock.

A slope or declivity in a manege ground down which a horse is made to gallop, to give suppleness to his haunches.

An instrument with four iron points, so disposed that, any three of them being on the ground, the other projects upward. They are scattered on the ground where an enemy's cavalry are to pass, to impede their progress by endangering the horses' feet.

The ground or spot on which tents, huts, etc., are erected for shelter, as for an army or for lumbermen, etc. Shzk.

Relating to an open fields; drowing in a field; growing in a field, or open ground.

The principal grounds of a college or school, between the buildings or within the main inclosure; as, the college campus.

r dry berries of various forms, which have an exceedingly pungent, biting taste, and when ground form the red of Cayenne pepper of commerce.

A genus of ground beetles, including numerous species. They devour many injurious insects.

A race course: the ground run over. To go back again the same career. Sir P. Sidney.

e American reindeer, especially the common or woodland species (Rangifer Caribou). Barren Ground caribou. See under Barren. -- Woodland caribou, the common reindeer (Rangifer Caribou) of the northern forests of America.

A double tripod (for holding a plate, etc.), having six feet, of which three rest on the ground, in whatever position in is placed.

A plant (Nepeta Glechoma) of the same genus with catnip; ground ivy.

A surface of ground on which water may be caught and collected into a reservoir.

That which is the occasion of an action or state; ground; reason; motive; as, cause for rejoicing.

Without just or sufficient reason; groundless. My fears are causeless and ungrounded. Denham.

A way or road rasid above the natural level of the ground, serving as a dry passage over wet or marshy ground. But that broad causeway will direct your way. Dryden. The other way Satan went down The causey to Hell-gate. Milton.

A work of more that ordinary heigh, rising from the level ground of a bastion, etc., and overlooking surrounding parts.

To place or inclosed in a cell. "Celled under ground." [R.] Warner.

A room or rooms under a building, and usually below the surface of the ground, where provisions and other stores are kept.

A place or ground set apart for the burial of the dead; a graveyard; a churchyard; a necropolis.