noun (n)

• money collected under a tariff(noun.possession)

  Synonym:
  custom, customs, customs duty
  

  source: wordnet30
• the lowest stone in an arch -- from which it springs(noun.artifact)

  Synonym:
  springer
  

  source: wordnet30
• That which is imposed or levied; a tax, tribute, or duty; especially, a duty or tax laid by goverment on goods imported into a country.(noun)

  source: webster1913