from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of a lower order than humans; subhuman.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A creature that is not (yet) at the level of understanding of a human being, such as a presymbolic child or an animal.
from The Century Dictionary and Cyclopedia
- Having attributes or qualities lower than the human in the scale of being: the opposite of superhuman.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. belonging to a group below humans in evolutionary development
infra- + human (Wiktionary)