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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 able to be obtained.
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.
obvious easily understood, recognized, or seen; apparent. [2 definitions]
obviously in a way that is easy to see or understand; clearly. [2 definitions]
oc- to. [3 definitions]
ocarina a small wind instrument that has a small mouthpiece and finger holes, is shaped somewhat like an elongated potato, and produces soft, hollow sounds.
occasion an incident or event, or the time at which it happens. [5 definitions]
occasional occurring infrequently or irregularly. [3 definitions]
occasionally at times; now and then; infrequently.
occident (cap.) the countries of Europe and the Western Hemisphere (usu. prec. by the).
occidental (often cap.) of or concerning the countries of Europe and the Western Hemisphere, their peoples, or their cultures; western. [2 definitions]
occipital of, pertaining to, or located near the back of the head and skull. [2 definitions]