zǐ​mǔ​kòu​r

snap fastener

  1. noun
    subordinate
    (bound form) secondary; subordinate; derived from a main body or source
  2. nut
    (bound form) nut (to hold a bolt); the female or larger part of a matching pair of objects
  3. fastener
    button; buckle; clasp
  4. r particleaffix
    [erhua suffix]
    A suffix attached to a word to form a retroflex ending, often indicating a small size, a sense of familiarity, or turning a word into a noun.