ob-

aff. a prefix meaning “toward,”“to,”“on,”“over,”“against,” occurring in loanwords from Latin; used also, with the senses “reversely,”“inversely,” to form New Latin and English scientific terms:

object; obligate; oblanceolate[/ex]

Also, o-, oc-, of-, op-. Etymology: ME (< OF) < L, repr. ob (prep.); in some scientific terms, < NL, L ob-