| cumulonimbus | (noun) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms | Synonyms: cumulonimbus cloud, thundercloud |
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| iambus | (noun) a metrical unit with unstressed-stressed syllables | Synonyms: iamb |
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| limbus | (noun) a border or edge of any of various body parts distinguished by color or structure | - |
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| lumbus | (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds | Synonyms: loin |
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| nimbus | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, halo |
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| (noun) a dark grey cloud bearing rain | Synonyms: nimbus cloud, rain cloud |
| rhombus | (noun) a parallelogram with four equal sides; an oblique-angled equilateral parallelogram | Synonyms: diamond, rhomb |
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| thrombus | (noun) a blood clot formed within a blood vessel and remaining attached to its place of origin | - |
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