from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sedimentary rock consisting predominantly of apatite and other phosphates.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a sedimentary rock rich in phosphate minerals such as apatite
from the GNU version of the Collaborative International Dictionary of English
- n. A massive variety of apatite.
from The Century Dictionary and Cyclopedia
- n. A name applied originally to a massive variety of apatite, but now used to embrace the more or less impure earthy to compact calcium phosphate which forms beds of considerable magnitude in some localities (Estremadura in Spain, Bohemia, etc.), and is of much economic importance.
phosphor(us) + -ite1.(American Heritage® Dictionary of the English Language, Fourth Edition)