from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Gypsum in the form of colorless clear crystals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A soft, glassy form of gypsum (chemical formula CaSO4·2H2O).
- n. The anion SeO32− derived from selenous acid; any salt or ester of selenous acid.
from the GNU version of the Collaborative International Dictionary of English
- n. A salt of selenious acid.
- n. A variety of gypsum, occuring in transparent crystals or crystalline masses.
from The Century Dictionary and Cyclopedia
- n. [capitalized] A supposed inhabitant of the moon.
- n. A foliated or crystallized and transparent variety of gypsum, often obtained in large thin plates somewhat resembling mica; also, specifically, a thin plate of this mineral used with the polarizing apparatus of the microscope.
- n. In chem., a salt of selenium.
Latin selēnītēs, from Greek selēnītēs (lithos), moon (stone), selenite (so called because it was believed to wax and wane with the moon), from selēnē, moon; see selenium.(American Heritage® Dictionary of the English Language, Fourth Edition)