ETYM AS. yldra, compar. of eald old. Related to Old.
Used of the older of two persons of the same name especially used to distinguish a father from his son; SYN. older, sr.

ETYM Latin senior, compar. of senex, gen. senis, old. Related to Sir.
Older; higher in rank; longer in length of tenure or service.
Used of the fourth and final year in United States high school or college; SYN. fourth-year.

The crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals.