n.
Variant: or hyp-
Function: prefix
Etymology: Late Latin hypo-, hyp-, from Greek, from hypo ― more at UP
1 : under : beneath : down < hypo blast> < hypo dermic>
2 : less than normal or normally < hyp esthesia> < hypo tension>
3 : in a lower state of oxidation : in a low and usually the lowest position in a series of compounds < hypo chlorous acid> < hypo xanthine>