ob-

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ob- comb. form of L. ob towards, against, in the way (of), with vars. OC-, OF-, OP-, occas. o- (as in OMIT); mostly in words already existing in L.; in mod. scientific L. (hence in Eng. adoptions) in the sense ‘inversely’, ‘in the opposite direction’, virtually repr. modL. obversē obversely, e.g. obovate ovate with the wider end presented.