| calibre | (noun) a degree or grade of excellence or worth | Synonyms: caliber, quality |
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| (noun) diameter of a tube or gun barrel | Synonyms: bore, caliber, gauge |
| fibre | (noun) a leatherlike material made by compressing layers of paper or cloth | Synonyms: fiber, vulcanized fiber |
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| (noun) the inherent complex of attributes that determines a persons moral and ethical actions and reactions | Synonyms: character, fiber |
| (noun) any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber) | Synonyms: fiber |
| (noun) coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis | Synonyms: fiber, roughage |
| (noun) a slender and greatly elongated substance capable of being spun into yarn | Synonyms: fiber |
| fibreboard | (noun) wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets | Synonyms: fiberboard, particle board |
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| fibreglass | (noun) a covering material made of glass fibers in resins | Synonyms: fiberglass |
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| fibreoptic | (adjective) of or relating to fiber optics | Synonyms: fiber-optic, fiberoptic, fibre-optic |
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| fibreoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fiberoptics, fibre optics |
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| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| libretto | (noun) the words of an opera or musical play | - |
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| semibreve | (noun) a musical note having the longest time value (equal to four beats in common time) | Synonyms: whole note |
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