Etymology
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jugular (adj.)

1590s, "pertaining to the throat or neck" (especially and originally in reference to the great veins of the neck), from Modern Latin jugularis, from Latin iugulum "collarbone, throat, neck," diminutive of iugum "yoke" (from PIE root *yeug- "to join"). As a noun, 1610s, short for jugular vein.

updated on May 12, 2017

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Definitions of jugular from WordNet
1
jugular (n.)
veins in the neck that return blood from the head;
Synonyms: jugular vein / vena jugularis
jugular (n.)
a vital part that is vulnerable to attack;
he always goes for the jugular
2
jugular (adj.)
relating to or located in the region of the neck or throat;
jugular vein
From wordnet.princeton.edu, not affiliated with etymonline.