From Proto-Indo-European *h₂ḱrós. Cognates include Old Church Slavonic остръ (ostrŭ), Latin ācer, Old Armenian ասեղն (asełn, “needle”) and Old English ecg (English edge).
ἄκρος • (ákros) m, ἄκρα f, ἄκρον n; first/second declension
- At the edge, extreme, beginning, end: outermost (especially of the top)
- pointed, sharp
- Being the most of any characteristic: best, oldest, first
First and second declension of ἄκρος, ἄκρᾱ, ἄκρον