burr

noun
1
a strong pronunciation of the ‘r’ sound, typical of some accents of (= ways of pronouncing) English; an accent with this type of pronunciation
گویش ر
2
the soft regular noise made by parts of a machine moving quickly
وزوز, صدای چرخش, صدای نرم
synonym whir
3
the seed container of some plants that sticks to clothes or fur
خارچسب, خار قلاب‌دار