Read the following passage: Slowly, little by little, I lifted the cloth, until a small, small light escaped from under it to fall upon — to fall upon that vulture eye! It was open — wide, wide open, and my anger increased as it looked straight at me. I could not see the old man’s face. Only that eye, that hard blue eye, and the blood in my body became like ice.
What does the word "vulture" mean in this text?