Etymology
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Words related to Atlas

a- (3)
prefix meaning "not, without," from Greek a-, an- "not" (the "alpha privative"), from PIE root *ne- "not" (source also of English un-).

In words from Greek, such as abysmal, adamant, amethyst; also partly nativized as a prefix of negation (asexual, amoral, agnostic). The ancient alpha privatum, denoting want or absence.

Greek also had an alpha copulativum, a- or ha-, expressing union or likeness, which is the a- expressing "together" in acolyte, acoustic, Adelphi, etc. It is from PIE root *sem- (1) "one; as one, together with."
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Atlantean (adj.)
1660s, "resembling or pertaining to Atlas" (q.v.). From 1852 as "pertaining to Atlantis" (q.v.).
Atlantic (adj.)
"of or pertaining to the sea off the west coast of Africa," early 15c., Atlantyke, from Latin Atlanticus, from Greek Atlantikos "of Atlas," adjectival form of Atlas (genitive Atlantos), in reference to Mount Atlas in Mauritania (see Atlas). Applied since c. 1600 to the ocean between Europe and Africa, on one side, and the Americas on the other. As a noun late 14c., Athlant, from Old French Atlante.
Atlantis 
mythical island-nation, by 1730, from Greek Atlantis, literally "daughter of Atlas," noun use of fem. adjective from Atlas (stem Atlant-; see Atlas). All references trace to Plato's dialogues "Timaeus" and "Critias," both written c. 360 B.C.E.
caryatid (n.)

"carved, robed female figure used as a column," 1560s, from French cariatide, from Latin caryatides, from Greek Karyatides (singular Karyatis) "priestesses of Artemis at Caryae" (Greek Karyai), a town in Laconia where dance festivals were held in Artemis' temple. Male figures in a like situation are Atlantes, plural of Atlas. Related: Caryatic.