Gomukhasana or Cow Face Pose is an asana. Sanskrit: Gomukhasana; Go - cow, mouth - face, posture - posture; Pronounced as: go-moo-KAHS-anna. This asana is derived from Sanskrit words, go meaning cow, Mukha meaning face, and asana meaning posture. Incidentally, the word 'go' also means light.
Hence 'Gomukh' can also mean lightness of head or lightness of head. However, this asana got its name because when one is doing this asana, the body resembles the face of a cow. The thighs and calves are placed such that they are wide at one end and tapering at the other.