| aquifer | (noun) underground bed or layer yielding ground water for wells and springs etc | - |
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| conifer | (noun) any gymnospermous tree or shrub bearing cones | Synonyms: coniferous tree |
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| crucifer | (noun) any of various plants of the family Cruciferae | Synonyms: cruciferous plant |
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| foraminifer | (noun) marine microorganism having a calcareous shell with openings where pseudopods protrude | Synonyms: foram |
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| heifer | (noun) young cow | - |
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| laticifer | (noun) a plant duct containing latex | - |
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| lifer | (noun) a prisoner serving a term of life imprisonment | - |
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| lucifer | (noun) lighter consisting of a thin piece of wood or cardboard tipped with combustible chemical; ignites with friction | Synonyms: friction match, match |
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| rotifer | (noun) minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion; constituents of freshwater plankton | - |
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| thurifer | (noun) an acolyte who carries a thurible | - |
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| umbellifer | (noun) any of numerous aromatic herbs of the family Umbelliferae | Synonyms: umbelliferous plant |
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