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Having two plane faces; as, the dihedral summit of a crystal. Dihedral angle, the angular space contained between planes which intersect. It is measured by the angle made by any two lines at right angles to the two planes.

A figure with two sides or surfaces. Buchanan.

Consisting of two hexagonal parts united; thus, a dihexagonal pyramid is composed of two hexagonal pyramids placed base to base.

A double iambus; a foot consisting of two iambuses (

A compound of a binary type containing two atoms of iodine; -- called also biniodide.

An argument which presents an antagonist with two or more alternatives, but is equally conclusive against him, whichever alternative he chooses.

sion that has length but no breadth or thickness; a straight or curved line. -- Space of two dimensions, extension which has length and breadth, but no thickness; a plane or curved surface. -- Space of three dimensions, extension which has length, breadth, and thickness; a solid. -- Space of four dimensions, as imag…

A division of Coleoptera, having two joints to the tarsi.

Composed of, or having, two parts of each kind.

Having two poetical measures or meters. -- n.

Ethane; -- sometimes so called because regarded as consisting of two methyl radicals. See Ethane.

Divided into two equal parts; reduced to half in shape or form.

Either one of the two forms of a dimorphous substance; as, calcite and aragonite are dimorphs.

Difference of form between members of the same species, as when a plant has two kinds of flowers, both hermaphrodite (as in the partridge berry), or when there are two forms of one or both sexes of the same species of butterfly. Dimorphism is the condition of the appearance of the same species under two dissimilar form…

Characterized by dimorphism; occurring under two distinct forms, not dependent on sex; dimorphic.

A wether sheep between one and two years old. [Scot.]

A vase or drinking cup having two handles or ears.

An oxide containing two atoms of oxygen in each molecule; binoxide.

Including two passovers. Carpenter.

Having two petals; two-petaled.