| presenile | Prior to the usual onset of senility, as in the milder, presenile dementia. (05 Mar 2000) |
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| presenile dementia | Dementia of Alzheimer's disease developing before age 65. Synonym: Alzheimer's disease. Primary dementia, dementia occurring independently as a mental disorder. (05 Mar 2000) |
| presenile spontaneous gangrene | Gangrene occurring in middle life as a result of thromboangiitis obliterans. (05 Mar 2000) |