from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Harmful; noxious.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Likely to cause harm or damage
from the GNU version of the Collaborative International Dictionary of English
- adj. Hurtful; noxious.
from The Century Dictionary and Cyclopedia
- Noxious; hurtful.
- Specifically, venomous or poisonous, as a serpent: thanatophidian; of or pertaining to the Nocua.
From Latin nocuus, from nocēre, to harm; see nek-1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)