beggar's-lice noun plural but singular or plural in construction orbeggar-lice\ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷\ 1.: any of several plants especially of the genera Lappula, Desmodium, and Galium bearing prickly or adhesive fruits that cling to clothing 2.: the fruit of beggar's-lice