| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aeonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: eonian |
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| (adjective) continuing forever or indefinitely | Synonyms: ageless, eonian, eternal, everlasting, perpetual, unceasing, unending |
| 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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| palaeolithic | (adjective) of or relating to the second period of the Stone Age (following the eolithic) | Synonyms: paleolithic |
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| palaeontological | (adjective) of or relating to paleontology | Synonyms: paleontological |
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