Origin of Ostensible
From French, from Latin ostensus, the past participle of ostendō (“show"), itself from obs- (“in front of") (akin to ob- (“in the way") and to Ancient Greek ἐπί (epi, “on, at, besides, after") and Old English eofot (“crime")) + tendō (“stretch") (akin to Ancient Greek τείνω (teinō)).
French from Medieval Latin ostēnsibilis from Latin ostēnsus past participle of ostendere to show ob- ob- tendere to stretch ten- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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