psis

Pronunciation:  US ['saɪs] UK ['saɪs]
  • abbr.(=
  • n.Greece language the 23rd letter
  • Webposterior superior illiac spine; Posterior superior iliac spine (posterior superior iliac spine); Pituitary stalk interruption syndrome (Pituitary Stalk Interruption Syndrome)
abbr.
1.
[ Education](= personized system of instruction) 
2.
[ Environmental Protection](= pollution standard index)