eldest

1 ENTRIES FOUND:
eldest /ˈɛldəst/ adjective
eldest
/ˈɛldəst/
adjective
Britannica Dictionary definition of ELDEST
always used before a noun
: of the greatest age : oldest
◊ Eldest is usually used to describe people who are members of the same family.

the eldest

— used in comparing the ages of people who are members of the same family