| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| semitropics | (noun) regions adjacent to the tropics | Synonyms: subtropics |
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| subtropics | (noun) regions adjacent to the tropics | Synonyms: semitropics |
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| topic | (noun) some situation or event that is thought about | Synonyms: issue, matter, subject |
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| (noun) the subject matter of a conversation or discussion | Synonyms: subject, theme |
| topicality | (noun) the attribute of being of interest at the present time | - |
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| topicalization | (noun) (linguistics) emphasis placed on the topic or focus of a sentence by preposing it to the beginning of the sentence; placing the topic at the beginning of the sentence is typical for English | - |
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| tropic | (noun) either of two parallels of latitude about 23.5 degrees to the north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the Torrid Zone or tropics | - |
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| tropicbird | (noun) mostly white web-footed tropical seabird often found far from land | Synonyms: boatswain bird, tropic bird |
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| tropics | (noun) the part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate | Synonyms: Torrid Zone, tropical zone |
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