| orcin | <chemistry> A colourless crystalline substance, C6H3.CH3.(OH)2, which is obtained from certain lichens (Roccella, Lecanora, etc), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein. Origin: Etymology uncertain: cf. F. Orcine. Source: Websters Dictionary (01 Mar 1998) |
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| orcinol | 3,5-dihydroxytoluene;the parent substance of the natural dye orcein, obtained from certain colourless lichens (Lecanora tinctoria, Rocella tinctoria) by treatment with boiling water; used as an external antiseptic in various skin diseases and in chemistry as a reagent for pentoses. Synonym: 5-methylresorcinol, orcin. (05 Mar 2000) |
| orcinol test | A test for pentoses with orcinol. Synonym: orcinol test. (05 Mar 2000) |