| ammobium | (noun) any plant of the genus Ammobium having yellow flowers and silvery foliage | - |
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| cambium | (noun) the inner layer of the periosteum | - |
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| (noun) a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth | - |
| columbium | (noun) a former name for niobium | - |
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| dendrobium | (noun) a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers | - |
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| erbium | (noun) a trivalent metallic element of the rare earth group; occurs with yttrium | Synonyms: atomic number 68, Er |
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| euphorbium | (noun) an acrid brown gum resin now used mainly in veterinary medicine | Synonyms: gum eurphorbium |
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| gastrolobium | (noun) any of various Australian evergreen shrubs of the genus Gastrolobium having whorled compound leaves poisonous to livestock and showy yellow to deep reddish-orange flowers followed by two-seeded pods | Synonyms: poison bush, poison pea |
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| labium | (noun) a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva) | - |
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| niobium | (noun) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium | Synonyms: atomic number 41, Nb |
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| terbium | (noun) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite | Synonyms: atomic number 65, Tb |
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| ununbium | (noun) a radioactive transuranic element, with atomic number 112 | Synonyms: atomic number 112, element 112, Uub |
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| ytterbium | (noun) a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime | Synonyms: atomic number 70, Yb |
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