ostium vs slit

ostium

noun
  • A small opening or orifice, as in a body organ or passage. 

  • Any of the small openings or pores in a sponge. 

  • The mouth of a river. 

slit

noun
  • The opening of the vagina. 

  • A narrow cut or opening; a slot. 

  • A woman, usually a sexually loose woman; a prostitute. 

verb
  • To split into strips by lengthwise cuts. 

  • To cut a narrow opening. 

  • To cut; to sever; to divide. 

adj
  • Having a cut narrow opening 

How often have the words ostium and slit occurred in a corpus of books? (source: Google Ngram Viewer )