| acantha | (noun) any sharply pointed projection | Synonyms: spine, spur |
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| benthal | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthic, benthonic |
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| coryphantha | (noun) a cactus of the genus Coryphantha | - |
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| enthalpy | (noun) (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure | Synonyms: H, heat content, total heat |
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| lanthanide | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanoid, lanthanon, rare-earth element, rare earth |
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| lanthanoid | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanide, lanthanon, rare-earth element, rare earth |
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| lanthanon | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanide, lanthanoid, rare-earth element, rare earth |
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| lanthanum | (noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth | Synonyms: atomic number 57, La |
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| unthankful | (adjective) not feeling or showing gratitude | Synonyms: thankless, ungrateful |
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| unthaw | (verb) become or cause to become soft or liquid | Synonyms: dethaw, dissolve, melt, thaw, unfreeze |
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| unthawed | (adjective) still frozen | - |
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| xanthate | (noun) a salt or ester of xanthic acid | - |
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