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Relating to, or forming, the base. Basal cleavage. See under Cleavage. -- Basal plane (Crystallog.), one parallel to the lateral or horizontal axis.

Having the nerves radiating from the base; -- said of leaves.

An imitation, in pottery, of natural basalt; a kind of black porcelain.

Pertaining to basalt; formed of, or containing, basalt; as basaltic lava.

In the form of basalt; columnar.

Formed like basalt; basaltiform.

Near the base.

One of the small pedestals, for statues or other ornaments, placed on the apex and at the basal angles of a pediment. Acroteria are also sometimes placed upon the gables in Gothic architecture. J. H. Parker.

A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava.

ans of touch, and in some species of Crustacea the cavity of the ear is situated near the basal joint. In insects, they are popularly called horns, and also feelers. The term in also applied to similar organs on the heads of other arthropods and of annelids.

of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene.

A lemon-yellow phosphate of uranium and calcium occurring in tabular crystals with basal cleavage, and in micalike scales. H., 2- 2.5. Sp. gr., 3.05-3.19.

The hollow basal part of a feather. Barrel bulk (Com.), a measure equal to five cubic feet, used in estimating capacity, as of a vessel for freight. -- Barrel drain (Arch.), a drain in the form of a cylindrical tube. -- Barrel of a boiler, the cylindrical part of a boiler, containing the flues. -- Barrel of the ear…

The basal plane of a crystal.

Said of crystalline rocks which contain a relatively low percentage of silica, as basalt. Basic salt (Chem.), a salt formed from a base or hydroxide by the partial replacement of its hydrogen by a negative or acid element or radical.

The basal joint of the legs of Crustacea.

Having the anterior toes connected by a basal web.

The horny basal portion of a feather; the barrel or quill.

The basal joint of the maxilla in insects.

ion not necessarily parallel to the plane of deposition; -- usually produced by pressure. Basal cleavage, cleavage parallel to the base of a crystal, or to the plane of the lateral axes. -- Cell cleavage (Biol.), multiplication of cells by fission. See Segmentation. -- Cubuc cleavage, cleavage parallel to the faces o…