| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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| archaeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeological, archeologic, archeological |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| chaetal | (adjective) of or relating to chaetae (setae or bristles) | - |
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| chaetognathan | (adjective) of or relating to arrowworms | Synonyms: chaetognathous |
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| chaetognathous | (adjective) of or relating to arrowworms | Synonyms: chaetognathan |
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| ischaemic | (adjective) relating to or affected by ischemia | Synonyms: ischemic |
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