| rhus | <botany> A genus of shrubs and small treets. See Sumac. Origin: L, sumac, fr. Gr. Source: Websters Dictionary (01 Mar 1998) |
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| rhus dermatitis | Contact dermatitis caused by cutaneous exposure to urushiol from species of Toxicodendron (Rhus), such as poison ivy, oak, or sumac. (05 Mar 2000) |
| Rhus toxicodendron antigen | An extract of fresh leaves of poison ivy, with 0.4% of procaine hydrochloride; used by intradermal injection to determine sensitiveness to the poison of Rhus toxicodendron. (05 Mar 2000) |
| Rhus venenata antigen | An extract of fresh leaves of poison sumac; used to determine sensitiveness to the plant or to relieve the dermatitis caused by contact with its leaves. (05 Mar 2000) |
| rhusma | <alchemy> A mixtire of caustic lime and orpiment, or tersulphide of arsenic, used in the depilation of hides. See: Rusma. (23 Aug 1998) |