code: def explain(term):
      """Get a description for a given POS tag, dependency label or entity type.
  
      term (str): The term to explain.
      RETURNS (str): The explanation, or `None` if not found in the glossary.
  
      EXAMPLE:
          >>> spacy.explain(u'NORP')
          >>> doc = nlp(u'Hello world')
          >>> print([w.text, w.tag_, spacy.explain(w.tag_) for w in doc])
      """
      if term in GLOSSARY:
          return GLOSSARY[term]
      else:
          warnings.warn(Warnings.W118.format(term=term))
  
label_desc: Use image node_id 1 for calling a global function with example usage: explain(term) and returns: GLOSSARY