| absinth | (noun) strong green liqueur flavored with wormwood and anise | Synonyms: absinthe |
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| amaranth | (noun) any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food | - |
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| (noun) seed of amaranth plants used as a native cereal in Central and South America | - |
| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| coelacanth | (noun) fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa | Synonyms: Latimeria chalumnae |
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| eighteenth | (adjective) coming next after the seventeenth in position | Synonyms: 18th |
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| (noun) position 18 in a countable series of things | - |
| eleventh | (adjective) coming next after the tenth and just before the twelfth in position | Synonyms: 11th |
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| (noun) position 11 in a countable series of things | - |
| fifteenth | (adjective) coming next after the fourteenth and just before the sixteenth in position | Synonyms: 15th |
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| (noun) position 15 in a countable series of things | - |
| fourteenth | (adjective) coming next after the thirteenth in position | Synonyms: 14th |
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| (noun) position 14 in a countable series of things | - |
| helminth | (noun) worm that is parasitic on the intestines of vertebrates especially roundworms and tapeworms and flukes | Synonyms: parasitic worm |
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| hyacinth | (noun) any of numerous bulbous perennial herbs | - |
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| (noun) a red transparent variety of zircon used as a gemstone | Synonyms: jacinth |
| jacinth | (noun) a red transparent variety of zircon used as a gemstone | Synonyms: hyacinth |
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| labyrinth | (noun) complex system of paths or tunnels in which it is easy to get lost | Synonyms: maze |
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| (noun) a complex system of interconnecting cavities; concerned with hearing and equilibrium | Synonyms: inner ear, internal ear |
| millionth | (adjective) the ordinal number of one million in counting order | - |
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| (noun) one part in a million equal parts | Synonyms: one-millionth |
| (noun) position 1,000,000 in a countable series of things | - |
| month | (noun) a time unit of approximately 30 days | - |
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| (noun) one of the twelve divisions of the calendar year | Synonyms: calendar month |
| nineteenth | (adjective) coming next after the eighteenth in position | Synonyms: 19th |
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| (noun) position 19 in a countable series of things | - |
| ninth | (adjective) coming next after the eighth and just before the tenth in position | Synonyms: 9th |
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| (noun) one part in nine equal parts | Synonyms: one-ninth |
| (noun) position nine in a countable series of things | - |
| nth | (adjective) last or greatest in an indefinitely large series | Synonyms: n-th |
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| perianth | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perigone, perigonium |
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| platyhelminth | (noun) parasitic or free-living worms having a flattened body | Synonyms: flatworm |
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| plinth | (noun) an architectural support or base (as for a column or statue) | Synonyms: footstall, pedestal |
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| pyracanth | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, firethorn, Pyracantha |
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| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
| quintillionth | (adjective) the ordinal number of one quintillion in counting order | - |
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| (noun) one part in a quintillion equal parts | Synonyms: one-quintillionth |
| seventeenth | (adjective) coming next after the sixteenth in position | Synonyms: 17th |
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| (noun) position 17 in a countable series of things | - |
| seventh | (adjective) coming next after the sixth and just before the eighth in position | Synonyms: 7th |
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| (noun) the musical interval between one note and another seven notes away from it | - |
| (noun) one part in seven equal parts | Synonyms: one-seventh |
| (noun) position seven in a countable series of things | - |
| sixteenth | (adjective) coming next after the fifteenth in position | Synonyms: 16th |
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| (noun) one part in sixteen equal parts | Synonyms: one-sixteenth, sixteenth part |
| (noun) position 16 in a countable series of things | - |
| tenth | (adjective) coming next after the ninth and just before the eleventh in position | Synonyms: 10th |
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| (noun) a tenth part; one part in ten equal parts | Synonyms: one-tenth, ten percent, tenth part |
| (noun) position ten in a countable series of things | - |
| terebinth | (noun) a Mediterranean tree yielding Chian turpentine | Synonyms: Pistacia terebinthus |
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| thirteenth | (adjective) coming next after the twelfth in position | Synonyms: 13th |
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| (noun) position 13 in a countable series of things | - |
| tragacanth | (noun) a gum used in pharmacy, adhesives, and textile printing | - |
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| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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| (noun) one part in a trillion equal parts | Synonyms: one-trillionth |
| twelvemonth | (noun) a period of time containing 365 (or 366) days | Synonyms: year, yr |
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| umpteenth | (adjective) last in an indefinitely numerous series | Synonyms: umptieth, umteenth |
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| umteenth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umptieth |
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