[1] : The Collaborative International Dictionary of English v.0.48

zygoma \zygo"ma\, n. nl., fr. gr. ?, fr. ? to yoke, zygo`n a
   yoke. anat.
   a the jugal, malar, or cheek bone.
   b the zygomatic process of the temporal bone.
   c the whole zygomatic arch.
       1913 webster

[2] : WordNet (r) 2.0

zygoma
     n : the slender arch formed by the temporal process of the
         cheekbone that bridges to the zygomatic process of the
         temporal bone syn: zygomatic arch, arcus zygomaticus
see also:
zygomatic arch arcus zygomaticus 

Zygoma >> Z Words
Zygoma, definition of term: Zygoma
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