circular

Adjective

• describing a circle; moving in a circle
  • the circular motion of the wheel
    

• having a circular shape

Noun

• an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
  • he mailed the circular to all subscribers
    

Related words

• Synonyms: 
  rotary , orbitual , round , handbill , bill , broadside , broadsheet , flier , flyer , throwaway