apex (English)

Where does "apex" come from?

The English noun 'apex', meaning a point, tip, or summit, was borrowed directly from Latin 'apex'[1]. The Latin term itself originates from Proto-Italic '*apeks'[2]. Further back in history, it derives from Proto-Indo-European '*h₂ep-', which means to join or fit[2].

Open questions

• The connection between the Latin term and Proto-Indo-European is approached with caution because a link through related meanings is only feasible alongside the observation that most nouns ending in ex and icis are technical terms lacking Indo-European origin. [2]

Full etymology tree

• apex (English), 'The highest or the greatest part of something, especially forming a point.'
  • borrowed apex (Latin), 'The extreme end of a thing; the point, summit, top.'
    • inherited *apeks (Proto-Italic)
      • derived *h₂ep- (Proto-Indo-European), 'water, body of water'

Ancestors

• apex (Latin)

Descendants and derived words

• antapex (English)
• apexcardiogram (English)
• apexcardiography (English)
• apex court (English)
• apexed (English)
• apex fallacy (English)
• apexification (English)
• apex predator (English)
• base over apex (English)
• orbital apex syndrome (English)
• periapex (English)
• subapex (English)

Sources

1. apex (English) - Wiktionary
2. apex (Latin) - Wiktionary

Updated August 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris