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eldest (adj.)

Old English (Mercian) eldrost "most advanced in age, that was born first," superlative of eald, ald "old" (see old). Superseded by oldest since 16c. Compare elder (adj.).

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Definitions of eldest from WordNet
1
eldest (n.)
the offspring who came first in the order of birth;
Synonyms: firstborn
2
eldest (adj.)
first in order of birth;
Synonyms: firstborn
From wordnet.princeton.edu