1701, "characterized by display or show from vanity or pride;" 1713, "showy, gaudy, intended for vain display," from ostentation + -ous. Earlier in a similar sense were ostentative (c. 1600); ostentive (1590s); ostentous (1620s). Related: Ostentatiously; ostentatiousness (1650s).
an ostentatious sable coat
osteitis
ostensible
ostensibly
ostensive
ostentation
ostentatious
osteo-
osteology
osteopath
osteopathy
osteoporosis
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