REZASITORA, sitorahoero nomand, ki andoza (az 1 to 0,01 hissai radiusi Oftob) va ravshanoiashon (az 1 to 10-4 hissai ravshanoii Oftob) nachandon kalon buda, massaashon ba 1—0,1 hissai massai Oftob barobar meboshad. Dar bayni Rezasitoraho sitorahoi eruptivi bisyorand.
Az jihati tarkib va bisyor khosiyathoyashon rezasitorahoi safed az Rezasitoraho yo khud Rezasitorahoi surkh farq mekunand.