frisbee
FRIZ-bee · noun
English
Origin
Frisbee comes from the trademark Frisbee, a brand name for a flying plastic disc toy.
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Journey
Over time, the brand name became so dominant that people started using it for any flying disc, regardless of who made it — a shift known as genericization.
Related words
It's related to the trademark it sprang from, having simply lowercased into everyday speech.