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obsolesce to become or be in the process of becoming obsolete.
obsolescent in the process of going out of use or style; becoming obsolete.
obsolete no longer in use, as a word or expression, or a type of implement or equipment. [2 definitions]
obstacle that which impedes or prevents forward movement or progress; obstruction.
obstetric of or pertaining to childbirth or obstetrics.
obstetrician a medical doctor whose specialty is pregnancy and childbirth.
obstetrics (used with a sing. verb) the branch of medicine that deals with pregnancy and childbirth.
obstinacy the state or quality of being stubborn; stubbornness. [2 definitions]
obstinate holding stubbornly to one's own ideas or purposes; unwilling to change. [2 definitions]
obstreperous hard to control, as children resisting adult discipline; unruly. [2 definitions]
obstruct to clog or block. [3 definitions]
obstruction something that obstructs; obstacle or impediment. [3 definitions]
obstructionist anyone who deliberately prevents the ordinary conduct of affairs.
obtain to gain possession of; acquire. [2 definitions]
obtainable combined form of obtain.
obtrude to thrust or force (oneself, one's concerns, or one's opinions) on another or others without being asked. [3 definitions]
obtrusive attracting unwanted notice. [3 definitions]
obtuse of an angle, greater than ninety degrees and less than 180 degrees. [3 definitions]
obtuse angle an angle greater than 90 degrees and less than 180 degrees.
obverse the face, front, or principal surface of anything, esp. of a coin, medal, or the like. (Cf. reverse). [5 definitions]
obviate to prevent or eliminate in advance; render unnecessary or irrelevant.