| alula | (noun) tuft of small stiff feathers on the first digit of a bird's wing | Synonyms: bastard wing, spurious wing |
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| (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: calypter |
| alular | (adjective) pertaining to alulae | - |
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| alum | (noun) a double sulphate of aluminum and potassium that is used as an astringent (among other things) | - |
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| (noun) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum | Synonyms: potash alum, potassium alum |
| (noun) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum | Synonyms: ammonia alum, ammonium alum |
| (noun) a person who has received a degree from a school (high school or college or university) | Synonyms: grad, graduate |
| alumbloom | (noun) any of several herbs of the genus Heuchera | Synonyms: alumroot |
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| alumina | (noun) any of various forms of aluminum oxide occurring naturally as corundum | Synonyms: aluminium oxide, aluminum oxide |
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| aluminate | (noun) a compound of alumina and a metallic oxide | - |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| aluminise | (verb) cover with aluminum | Synonyms: aluminize |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| aluminize | (verb) cover with aluminum | Synonyms: aluminise |
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| aluminous | (adjective) pertaining to or containing aluminum or alum | - |
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| aluminum | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminium, atomic number 13 |
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| alumna | (noun) a female person who has received a degree from a school (high school or college or university) | - |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alumroot | (noun) any of several herbs of the genus Heuchera | Synonyms: alumbloom |
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| alundum | (noun) a substance made of fused alumina | - |
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