| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aeon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: eon |
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| (noun) an immeasurably long period of time | Synonyms: eon |
| (noun) the longest division of geological time | Synonyms: eon |
| 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 |
| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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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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| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archeology |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| dromaeosaur | (noun) a kind of maniraptor | - |
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| gynaeolatry | (noun) the worship of women | Synonyms: gyneolatry, woman-worship |
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| paeony | (noun) any of numerous plants widely cultivated for their showy single or double red or pink or white flowers | Synonyms: peony |
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| palaeoanthropology | (noun) the scientific study of human fossils | Synonyms: human palaeontology, human paleontology, paleoanthropology |
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| palaeobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: paleobiology |
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| palaeobotany | (noun) the study of fossil plants | Synonyms: paleobotany |
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| palaeoclimatology | (noun) the study of the climate of past ages | Synonyms: paleoclimatology |
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| palaeodendrology | (noun) the branch of paleobotany that studies fossil trees | Synonyms: paleodendrology |
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| palaeoecology | (noun) the branch of ecology that studies ancient ecology | Synonyms: paleoecology |
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| palaeoethnography | (noun) the ethnography of paleolithic humans | Synonyms: paleoethnography |
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| palaeogeography | (noun) the study of the geography of ancient times or ancient epochs | Synonyms: paleogeography |
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| palaeogeology | (noun) the study of geologic features once at the surface of the earth but now buried beneath rocks | Synonyms: paleogeology |
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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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| palaeology | (noun) the study of (especially prehistoric) antiquities | Synonyms: paleology |
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| palaeontological | (adjective) of or relating to paleontology | Synonyms: paleontological |
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| palaeontologist | (noun) a specialist in paleontology | Synonyms: fossilist, paleontologist |
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| palaeontology | (noun) the earth science that studies fossil organisms and related remains | Synonyms: fossilology, paleontology |
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| palaeopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: paleopathology |
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| palaeornithology | (noun) the paleobiology of birds | Synonyms: paleornithology |
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| palaeozoology | (noun) the study of fossil animals | Synonyms: paleozoology |
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| phaeochromocytoma | (noun) a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension | Synonyms: pheochromocytoma |
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| protoarchaeology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarcheology |
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| spelaeologist | (noun) a person who explores caves | Synonyms: potholer, speleologist, spelunker |
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| spelaeology | (noun) the pastime of exploring caves | Synonyms: speleology |
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| (noun) the scientific study of caves | Synonyms: speleology |