IPA: /dɪˈtæsəl/
KK: /dɪˈtæsəl/
To take off the tassel, which is the part of a corn plant that produces pollen, from a female corn plant during the process of making hybrids.
Farmers detassel corn plants to improve the quality of the hybrid seeds.
Past: detasseled
Past Participle: detasseled
Detassel is formed from "de-" (meaning down or away) and "tassel" (from Middle English *tasel*, meaning a tuft or a bunch). The word refers to the act of removing the tassels or tufts from corn plants, typically to improve crop yield.
Think of 'removing' ('de-') the 'tufts' ('tassel') from corn plants — that's what detassel means.