The Collaborative International Dictionary of English v.0.48:

Jugular \Ju"gu*lar\, n. [Cf. F. jugulaire. See Jugular, a.]
   [1913 Webster]
   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.
      [1913 Webster]

   2. (Zool.) Any fish which has the ventral fins situated
      forward of the pectoral fins, or beneath the throat; one
      of a division of fishes (Jugulares).
      [1913 Webster]

WordNet (r) 3.0 (2006):

jugular vein
    n 1: veins in the neck that return blood from the head [syn:
         jugular vein, vena jugularis, jugular]