ar·cane

[ahr-keyn]
adjective
known or understood by very few; mysterious; secret; obscure; esoteric: She knew a lot about Sanskrit grammar and other arcane matters.

Origin:
1540–50; (< Middle French) < Latin arcānus, equivalent to arc(ēre) to shut up, keep (derivative of arca a chest, box) + -ānus -an

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arcane (ɑːˈkeɪn) [Click for IPA pronunciation guide]
 
adj
requiring secret knowledge to be understood; mysterious; esoteric
 
[C16: from Latin arcānus secret, hidden, from arcēre to shut up, keep safe]
 
ar'canely
 
adv
 
ar'caneness
 
n

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Word Origin & History

arcane
1540s, from L. arcanus "secret, hidden," from arcere "close up, enclose, contain," from arca "chest, box," from PIE *ark- "to hold, contain, guard" (cf. Gk. arkos "defense," arkein "to ward off;" Arm. argel "obstacle;" Lith. raktas "key," rakinti "to shut, lock").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He immersed himself in their arcane biology, and he interviewed numerous
  scientists and security experts.
The illustrations are a mix of overfamiliar and refreshingly arcane.
Everyone will learn a lot about the arcane art of scrimshaw.
Once you've grasped that idea, one aspect of the mystery of development isn't
  particularly arcane.
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