apex

noun19

1. •
   The highest or the greatest part of something, especially forming a point.
2. •
   The highest point in a plane or solid figure, relative to a base line or plane.
3. •
   (US) The end or edge of a vein nearest the surface.
4. •
   [before a noun] The top of the food chain.
5. •
   (figurative) The moment of greatest success, expansion, etc.

   • It would be an intense disgust. The absolute apex of teen angst. — 2002
6. •
   The pointed fine end of something.
7. •
   The lowest part of the human heart.

   • B.P. 118/68. Grade I diastolic murmur best heard over apex. Patient well and had no complaints referable to heart. Origin of the diastolic murmur is open to conjecture. — 1951
8. •
   The deepest part of a tooth's root.
9. •
   The end of a leaf, petal or similar organ opposed to the end where it is attached to its support.
10. •
    The growing point of a shoot.
11. •
    The lowest point on a pendant drop of a liquid.
12. •
    A sharp upward point formed by two strokes that meet at an acute angle, as in "W", uppercase "A", and closed-top "4", or by a tapered stroke, as in lowercase "t".
13. •
    The part of a corner where the racing line is nearest the inside of the bend.

    • Drone cameras show that his car reached the apex first.
14. •
    The point on the celestial sphere toward which the Sun appears to move relative to nearby stars.
15. •
    (euphemistic) A woman's crotch and sex organs.

    • Licking her apex, he slid his hand up between her legs and slid his fingers into her heat. — 2014
16. •
    A diacritic in Classical Latin that resembles and gave rise to the acute.
17. •
    An obstacle for a horse to jump over, consisting of a triangular corner fence.
18. •
    A diacritic in Middle Vietnamese that indicates /ŋ͡m/.
19. •
    A conical priest cap.

noun3

1. •
   Acronym of advance purchase excursion (an air fare).
2. •
   Acronym of acetone peroxide.
3. •
   Acronym of accelerated peritoneal equilibration examination.