in astronomy, are the same with parallels of latitude in geography.

PARALLELOPIPED, in geometry, a regular solid comprehended under six parallelograms, the opposite ones whereof are similar, parallel, and equal to each other.

PARALLELOPIEDIA, in natural history, a genus of spars, externally of a determinate and regular figure, always found loose, detached, and separate from all other bodies, and in form of an oblique parallelo-piped, with six parallelogram sides and eight solid angles; easily fissile either in an horizontal or perpendicular direction; being composed of numbers of thin plates, and those very elegantly and regularly arranged bodies, each of the same form with the whole mass, except that they are thinner in proportion to their horizontal planes, and naturally fall into these and no other figures, on being broken with a slight blow.