nipper vs pterygium

nipper

noun
  • The claws of a crab or lobster. 

  • A child. 

  • Any of various devices (as pincers) for nipping. 

  • A European crab (Polybius henslowii). 

  • A young bluefish. 

  • One who, or that which, nips. 

  • A boy working as a navvies' assistant. 

  • A fish, the cunner. 

  • One of a pair of automatically locking handcuffs. 

  • A child aged from 5 to 13 in the Australian surf life-saving clubs. 

  • One of four foreteeth in a horse. 

  • A mosquito. 

verb
  • To seize (two ropes) together. 

pterygium

noun
  • A generalized limb of a vertebrate 

  • An abnormal mass of tissue in the corner of the eye that obstructs vision 

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