| aboriginal | (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
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| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| boring | (noun) the act of drilling a hole in the earth in the hope of producing petroleum | Synonyms: drilling, oil production |
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| (noun) the act of drilling | Synonyms: drilling |
| boringness | (noun) extreme dullness; lacking spirit or interest | Synonyms: dreariness, insipidity, insipidness |
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| fluoroboride | (noun) a salt of fluoroboric acid | - |
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| helleborine | (noun) any of several orchids of the genus Cephalanthera | - |
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| (noun) any of various orchids of the genus Epipactis | - |
| (noun) any of several small temperate and tropical orchids having mottled or striped leaves and spikes of small yellowish-white flowers in a twisted raceme | Synonyms: rattlesnake plantain |
| laboriousness | (noun) the quality of requiring extended effort | Synonyms: operoseness, toilsomeness |
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