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Palmately branched, with the branches again palmated.

Having two margins toothed like a comb.

Having a shell or covering like a double shield.

Having two wings. "Bipennated insects." Derham.

Twice pinnate.

Twice folded together. Henslow.

Having two punctures, or spots.

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

wer, or the square of the square. Thus 4x4=16, the square of 4, and 16x16=256, the biquadrate of 4.

Having two rays; as, a biradiate fin.

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

Having two little bags, sacs, or pouches.

Resembling two bucklers placed side by side.

With two partitions or septa. Gray.

In two rows or series.

Doubly serrate, or having the serratures serrate, as in some leaves.

ratio of the oxygen of the silica to the oxygen of the base is as two to one. The bisilicates include many of the most common and important minerals.

Having two grooves or furrows.

A sulphate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid to the positive or basic portion twice what it is in the normal sulphates; an acid sulphate.

salt of tartaric acid in which the base replaces but half the acid hydrogen; an acid tartrate, as cream of tartar.