IPA: /ˈhʌndrədˌweɪt/
KK: /hʌndrədˌweɪt/
A unit of weight that is used to measure heavy items, equal to either 100 pounds in the U.S. or 112 pounds in the UK.
The shipment weighed over a hundredweight, making it quite heavy to lift.
Hundredweight is formed from "hundred" (from Old English "hundred", meaning a group of one hundred) and "weight" (from Old English "wēght", meaning heaviness or mass). The term refers to a unit of weight that is equivalent to one hundred pounds in the United States or one hundred stones in the United Kingdom.
Think of a 'group of one hundred' ('hundred') and how heavy that is ('weight') — that's what hundredweight means.