from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having a harmful effect; injurious: the deleterious effects of smoking.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. harmful often in a subtle or unexpected way (as for example deleterious effects, deleterious to health).
from the GNU version of the Collaborative International Dictionary of English
- adj. Hurtful; noxious; destructive; pernicious
from The Century Dictionary and Cyclopedia
- Having the quality of destroying life; noxious; poisonous: as, a deleterious plant.
- Hurtful in character or quality; injurious; pernicious; mischievous; unwholesome: as, a deleterious practice; deleterious food.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. harmful to living things
From Greek dēlētērios, from dēlētēr, destroyer, from dēleisthai, to harm.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek δηλητήριος (dēlētērios, "noxious, deleterious"), from δηλητήρ (dēlētēr, "a destroyer"), from δηλέομαι (dēleomai, "I hurt, damage, spoil, waste"). (Wiktionary)