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a plural of .
the tip, point, or vertex; summit.
climax; peak; acme:
His election to the presidency was the apex of his career.
Astronomy, .
Historical Examples

Valve ovate-lanceolate to lanceolate; apices obtuse, not produced.
The Diatomaceae of Philadelphia and Vicinity Charles Sumner Boyer

The itching is intense, and in consequence their apices are excoriated.
Essentials of Diseases of the Skin Henry Weightman Stelwagon

The Caudal Appendages exist as two very minute plates, with a few bristles at their apices.
A Monograph on the Sub-class Cirripedia (Volume 1 of 2) Charles Darwin

The palpi are small and narrow, with long bristles at their apices.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) Charles Darwin

This phenomena of primitive rocks forming the apices of mountains may be explained differently.
The Mosaic History of the Creation of the World Thomas Wood

As many as a dozen small ulcers were seen at the apices of the enlarged follicles.
A System of Practical Medicine By American Authors, Vol. II Various

The orbits have a sort of heart-shape, their apices being turned forwards, and their more convex sides inwards.
The Journal of the Proceedings of the Linnean Society – Vol. 4 Various

The elaters are never fusiform, the apices always abrupt in their acumination, and the sculpture irregular and uneven.
The North American Slime-Moulds Thomas H. (Thomas Huston) MacBride

The two apices differ very nearly 180° in right ascension and about 120° in declination.
Curiosities of the Sky Garrett Serviss

The teeth are two on each side of the mandible, with their apices directed forwards.
The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard

noun
a plural of apex
noun (pl) apexes, apices (ˈæpɪˌsiːz; ˈeɪ-)
the highest point; vertex
the pointed end or tip of something
a pinnacle or high point, as of a career, etc
(astronomy) Also called solar apex. the point on the celestial sphere, lying in the constellation Hercules, towards which the sun appears to move at a velocity of 20 kilometres per second relative to the nearest stars
noun acronym
Advance Purchase Excursion: a reduced airline or long-distance rail fare that must be paid a specified number of days in advance
(in Britain) Association of Professional, Executive, Clerical, and Computer Staff
n.

c.1600, from Latin apex “summit, peak, tip, top, extreme end;” probably related to apere “to fasten, fix,” hence “the tip of anything” (one of the meanings in Latin was “small rod at the top of the flamen’s cap”), from PIE *ap- “to take, reach.” Proper plural is apices.

apex a·pex (ā’pěks)
n. pl. a·pex·es or a·pi·ces (ā’pĭ-sēz’, āp’ĭ-)
The pointed end of a conical or pyramidal structure.
apex
(ā’pěks)
The highest point, especially the vertex of a triangle, cone, or pyramid.
Arctic Polynya Experiment