IPA: /ˈsɜːr.kjʊ.leɪ.tər/
KK: /sɜrˈkjuleɪtər/
A person or thing that helps something move around or spread out, like a bus system that goes in a loop or an electronic device that directs signals.
The circulator in the heating system ensures warm air flows throughout the house.
Circulator → It is formed from "circum-" (meaning around) and "-lator" (from "latus", meaning to carry). The word "circulator" refers to something that carries or moves around, often in a circular motion.
Think of something that 'carries around' ('circum-') — that's why a circulator is involved in moving things around.