Adjective

Definition

1:  stretched out with face on the ground in adoration or submission; also  :  lying flat

2:completely overcome and lacking vitality, will, or power to rise

3. trailing on the ground

This word from Cora Unashamed by Langston Hughes. “All the family dressed in deep mourning. Mrs. Art was prostrate.”  This is a scene that on the funeral of Mrs. Art’s daughter. She shows like very weak and depressed. I’ve learned this word before, but forget some parts of its meaning, 

reference: http://www.merriam-webster.com/dictionary/prostrate