from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A substance made of crushed and coarsely ground bones that is used as a plant fertilizer and in animal feed.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Ground bones used as a slow-release fertilizer, especially for bulbs.
Sorry, no etymologies found.
Avoid “natural” calcium supplements such as oyster-shell calcium or bone meal that are less regulated and may contain lead.