Words in english starting with O

• on the coattails — Adverb – English ～ immediately following or undeservedly benefiting from; "the CEO resigned on the coattails of the scandal"; "he was elected on his predecessor's coattails"
• on the spot — Adverb – English ～ at the place in question; there; "they were on the spot when it happened"; "it had to be decided by the man on the spot"
• on the spot — Adverb – English ～ in a difficult situation; "that question really put him on the spot"
• on the fly — Adverb – English ～ while in motion; "he caught the punt on the fly"
• on the dot — Adverb – English ～ just as it should be; "`Precisely, my lord,' he said"
• on the fly — Adverb – English ～ on the run or in a hurry; "she wrote those letters on the fly"
• operating theater — Noun – English ～ a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"
• operating theatre — Noun – English ～ a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"
• order Thecodontia — Noun – English ～ extinct terrestrial reptiles having teeth set in sockets; of the late Permian to Triassic
• Ostwald's theory of indicators — Noun – English ～ (chemistry) the theory that all indicators are either weak acids or weak bases in which the color of the ionized form is different from the color before dissociation
• order Therapsida — Noun – English ～ extinct mammal-like reptiles found inhabiting all continents from the mid Permian to late Triassic
• occupational therapy — Noun – English ～ therapy based on engagement in meaningful activities of daily life, especially to enable or encourage participation in such activities in spite of impairments or limitations in physical or mental functions
• oven thermometer — Noun – English ～ a thermometer that registers the temperature inside an oven
• out of thin air — Adverb – English ～ without warning; "your cousin arrived out of thin air"
• out-of-the-box thinking — Noun – English ～ thinking that moves away in diverging directions so as to involve a variety of aspects and which sometimes lead to novel ideas and solutions; associated with creativity
• one-third — Noun – English ～ one of three equal parts of a divisible whole; "it contains approximately a third of the minimum daily requirement"
• one-thirty-second — Noun – English ～ one part in thirty-two equal parts
• one hundred thirty — Adjective – English ～ being ten more than one hundred twenty
• one hundred thirty-five — Adjective – English ～ being five more than one hundred thirty
• Our Lady's mild thistle — Noun – English ～ tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America

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