Webster's English Dictionary

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fundus

fun.dus \'f*n-d*s\ \-.di-, -.de-\ n or fun.di [NL, fr. L, bottom] pl  : the 
   bottom of or part opposite the aperture of the internal surface of a  
   hollow organ : as : the greater curvature of the stomach  : the lower back 
   part of the bladder  : the large upper end of the uterus  : the part of the 
   eye opposite the pupil