| rib | (noun) support resembling the rib of an animal | - |
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| (noun) a projecting molding on the underside of a vault or ceiling; may be ornamental or structural | - |
| (noun) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) | Synonyms: costa |
| (noun) a riblike supporting or strengthening part of an animal or plant | - |
| (noun) a teasing remark | - |
| (noun) cut of meat including one or more ribs | - |
| ribald | (noun) a ribald person; someone who uses vulgar and offensive language | - |
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| ribaldry | (noun) behavior or language bordering on indelicacy | Synonyms: gaminess, raciness, spiciness |
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| (noun) ribald humor | - |
| riband | (noun) a ribbon used as a decoration | Synonyms: ribband |
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| ribavirin | (noun) an inhaled antiviral agent (trade name Virazole) that may be used to treat serious virus infections | Synonyms: Virazole |
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| ribband | (noun) a ribbon used as a decoration | Synonyms: riband |
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| ribbing | (noun) the act of harassing someone playfully or maliciously (especially by ridicule); provoking someone with persistent annoyances | Synonyms: tantalization, tease, teasing |
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| (noun) a framework of ribs | - |
| ribbon | (noun) notion consisting of a narrow strip of fine material used for trimming | - |
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| (noun) a long strip of inked material for making characters on paper with a typewriter | Synonyms: typewriter ribbon |
| (noun) an award for winning a championship or commemorating some other event | Synonyms: decoration, laurel wreath, medal, medallion, palm |
| (noun) any long object resembling a thin line | Synonyms: thread |
| ribbonfish | (noun) marine fish having a long compressed ribbonlike body | - |
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| (noun) thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin | Synonyms: king of the herring, oarfish, Regalecus glesne |
| ribbonwood | (noun) small tree or shrub of New Zealand having a profusion of axillary clusters of honey-scented paper-white flowers and whose bark is used for cordage | Synonyms: Hoheria populnea, houhere, lacebark |
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| (noun) deciduous New Zealand tree whose inner bark yields a strong fiber that resembles flax and is called New Zealand cotton | Synonyms: Plagianthus betulinus, Plagianthus regius, ribbon tree |
| ribgrass | (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: buckthorn, English plantain, narrow-leaved plantain, Plantago lanceolata, ribwort, ripple-grass |
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| ribier | (noun) dark reddish-purple table grape of California | - |
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| riboflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, lactoflavin, ovoflavin, vitamin B2, vitamin G |
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| ribonuclease | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonucleinase, RNase |
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| ribonucleinase | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonuclease, RNase |
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| ribose | (noun) a pentose sugar important as a component of ribonucleic acid | - |
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| ribosome | (noun) an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell | - |
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| ribwort | (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: buckthorn, English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ripple-grass |
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