| Arndt's law | An obsolete law stating that weak stimuli excite physiologic activity, moderately strong ones favour it, strong ones retard it, and very strong ones arrest it. (05 Mar 2000) |
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| Arndt, G | <person> German physician, 1874--1929. See: Arndt-Gottron syndrome. (05 Mar 2000) |
| Arndt, Rudolph | <person> German psychiatrist, 1835-1900. See: Arndt's law. (05 Mar 2000) |
| Arndt-Gottron syndrome | Generalised lichen myxoedematosus with diffuse thickening of the skin underlying the papules. Synonym: Arndt-Gottron syndrome. (05 Mar 2000) |