amniotic fluid vs moisture

amniotic fluid

noun
  • In placental mammals, a fluid contained within the amnion membrane that surrounds a developing embryo or fetus. 

moisture

noun
  • That which moistens or makes damp or wet; exuding fluid; liquid in small quantity. 

  • The state of being moist. 

  • Skin moisture noted as dry, moist, clammy, or diaphoretic as part of the skin signs assessment. 

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