/ˈɹut/
1.n.(botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground
2.n.the place where something begins, where it springs into being
“the Italian beginning of the Renaissance”
3.n.(linguistics) the form of a word after all affixes are removed
“thematic vowels are part of the stem”