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| i·so·bar [ ssə br ] (plural i·so·bars) |
noun |
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1. line showing weather patterns: a line drawn on a weather map that connects places with equal atmospheric pressure. Isobars are often used collectively to indicate the movement or formation of weather systems.
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2. atom with same mass number: one of two or more atoms or elements that have the same mass number but different atomic numbers
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| [Mid-19th century. < Greek isobaros "of equal weight"] |
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 i·so·bar·ism noun |
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