noun (n)

• a slight but appreciable amount(noun.quantity)

  Synonym:
  hint, jot, pinch, soupcon, speck, tinge, touch
  

  source: wordnet30
• any of numerous very small to minute arachnids often infesting animals or plants or stored foods(noun.animal)

  source: wordnet30
• A minute arachnid, of the order Acarina, of which there are many species; as, the cheese mite, sugar mite, harvest mite, etc. See Acarina.(noun)

  source: webster1913