Source : Webster's Revised Unabridged Dictionary (1913)

Jugular \Ju"gu*lar\, n. [Cf. F. jugulaire. See {Jugular}, a.]
   1. (Anat.) One of the large veins which return the blood from
      the head to the heart through two chief trunks, an
      external and an internal, on each side of the neck; --
      called also the {jugular vein}.

   2. (Zo["o]l.) Any fish which has the ventral fins situated
      forward of the pectoral fins, or beneath the throat; one
      of a division of fishes ({Jugulares}).

Jugular \Ju"gu*lar\, a. [L. jugulum the collar bone, which joins
   together the shoulders and the breast, the throat, akin to
   jungere to yoke, to join: cf. F. jugulaire. See {Join}.]
   1. (Anat.)
      (a) Of or pertaining to the throat or neck; as, the
          jugular vein.
      (b) Of or pertaining to the jugular vein; as, the jugular
          foramen.

   2. (Zo["o]l.) Having the ventral fins beneath the throat; --
      said of certain fishes.

Source : WordNet®

jugular
     adj : relating to or located in the region of the neck or throat;
           "jugular vein"
     n 1: veins in the neck that return blood from the head [syn: {jugular
          vein}, {vena jugularis}]
     2: a vital part that is vulnerable to attack; "he always goes
        for the jugular"