A'PEX, noun plural apexes. [Latin apex plural apices.] The tip, point of summit of any thing. In antiquity, the cap of a flamen or priest; the crest of a helmet. In grammar, the mark of a long syllable. In botany, the anther of flowers, or tops of the stamens, like knobs.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI