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One of the needlelike or bristlelike spines or prickles of some animals and plants; also, a needlelike crystal.

Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needless. A*cic"u*lar*ly, adv.

Acicular.

Needle-shaped; acicular.

Minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.

A kind of crystallite having a (slender) acicular form.

A zeolite occuring in groups of glassy acicular crystals, and in masses which often have a radiated structure. It is a hydrous silicate of alumina and soda.

ugh the shed by a long eye-pointed needle instead of by a shuttle. -- Needle ore (Min.), acicular bismuth; a sulphide of bismuth, lead, and copper occuring in acicular crystals; -- called also aikinite. -- Needle shell (Zoöl.), a sea urchin. -- Needle spar (Min.), aragonite. -- Needle telegraph, a telegraph in whic…

ry leaves of the branchlets reduced to mere scales, and the secondary ones (pine needles) acicular, and usually in fascicles of two to seven. See Pine.

Acicular rutile occurring in reticulated forms imbedded in quartz.

Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.

black and shining stem and branches. -- Venus's hair stone (Min.), quartz penetrated by acicular crystals of rutile. -- Venus's looking-glass (Bot.), an annual plant of the genus Specularia allied to the bellflower; -- also called lady's looking- glass. -- Venus's navelwort (Bot.), any one of several species of Omp…