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Having two margins toothed like a comb.

A two-footed animal, as man.

Having two feet; biped.

Having two wings. "Bipennated insects." Derham.

Having two petals.

An aëroplane with two main supporting surfaces one above the other.

Doubly polar; having two poles; as, a bipolar cell or corpuscle.

A combination of two short rectangular glass prisms cemented together at their diagonal faces so as to form a cube; -- called also optical cube. It is used in one form of photometer.

Having two punctures, or spots.

Having two points.

Having an eyelike spot on the wing, with two dots within it of a different color, as in some butterflies.

Consisting of two pyramids placed base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals.

Having two rays; as, a biradiate fin.

Having, or consisting of, two branches.

Containing or having two right angles; as, a birectangular spherical triangle.

An ancient galley or vessel with two banks or tiers of oars.

Having a double beak, or two processes resembling beaks. The capsule is bilocular and birostrated. Ed. Encyc.

The act of bringing forth; as, she had two children at a birth. "At her next birth." Milton.

Having two little bags, sacs, or pouches.

Resembling two bucklers placed side by side.