Apexes

the tip, point, or vertex; summit.
climax; peak; acme:
his election to the presidency was the apex of his career.
astronomy, .
historical examples

it has two cone-shaped superimposed gl-ss globes connected at their apexes through a small opening.
time telling through the ages harry chase brearley

the leading design is naturally the herati, and again one sees the palm leaf with its apexes all pointing in the same direction.
rugs: oriental and occidental, antique & modern rosa belle holt

it was the duplicating lines of the departing sun, upon the castellated rocks, as they pierced between the apexes and the basin.
mal moule ella wheeler wilc-x

the centre gable overlaps the portal beneath, and the apexes of the two side gables are beyond the middle of the two side portals.
cathedral cities of italy william wiehe collins

the household cavalry were given helmets with weeping plumes fixed to the apexes.
chats on military curios stanley c. johnson

their apexes will probably come at about k and m in fig. 208.
toy-making in school and home ruby kathleen polkinghorne and mabel irene rutherford polkinghorne

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) -ssociation 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