- showing a decline or deterioration of physical strength or mental functioning, especially short-term memory and alertness, as a result of old age or disease.
- of or belonging to old age or aged persons; gerontological; geriatric.
- (of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level.
- a senile person.
- of, relating to, or characteristic of old age
- mentally or physically weak or infirm on account of old age
- (of land forms or rivers) at an advanced stage in the cycle of erosion
