George Martin Lane,
A Latin Grammar for Schools and Colleges
“ A root is not a real word; it is neither a noun, naming something, nor a verb, denoting action. Thus iug-, yoke, does not mean a yoke nor I yoke; it merely suggests something about yoking. The root becomes a real word only when an inflection ending is added, or, more commonly, both a formative suffix and an inflection ending: as, iug-u-m, a yoke.185. Roots are common to Latin and its cognate languages, such as the Sanskrit and the Greek. When a root is named in this book, the specific Latin form of the root is meant. ”
