| Rocky Mountain spotted fever vaccine | Suspension of inactivated Rickettsia rickettsii prepared by growing the rickettsiae in the embryonate yolk sac of fowl eggs. (05 Mar 2000) |
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| rocoa | The orange-coloured pulp covering the seeds of the tropical plant Bixa Orellana, from which annotto is prepared. See Annoto. Origin: Cf. F. Rocou, roicou, Pg. & Braz, uruco. Source: Websters Dictionary (01 Mar 1998) |
| rococo | A florid style of ornamentation which prevailed in Europe in the latter part of the eighteenth century. Origin: F.; of uncertain etymology. Source: Websters Dictionary (01 Mar 1998) |