from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small, dark, needle-shaped crystal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A kind of crystallite resembling a bunch of hairs, common in obsidian.
- n. A delicate, hair-like siliceous spicule, found in certain sponges.
from the GNU version of the Collaborative International Dictionary of English
- n. A kind of crystallite resembling a bunch of hairs, common in obsidian. See Illust. of Crystallite.
- n. A delicate, hairlike siliceous spicule, found in certain sponges.
from The Century Dictionary and Cyclopedia
- n. One of the minute acicular crystals of which the starch-grains of plants are supposed to consist.
- n. A kind of flesh-spicule or microsclere of some sponges; a fibrillate spicule, in which the silica, instead of being deposited in concentric coatings around an axis, forms within the scleroblast a sheaf of exceedingly fine fibrillæ which may be straight or twisted; also, one of these fibrillæ: as, “fine fibrillæ or trichites,”
- n. In lithology, one of various dark-colored (or even black) opaque microliths, having more or less of a curved and twisted form: frequently seen in thin sections of vitreous rocks, especially in obsidian.
- Same as trichitic.
Ancient Greek (Wiktionary)