Classical compounds and neoclassical compounds are compound words composed from combining forms derived from classical Latin or ancient Greek roots. New Latin comprises many such words and is a substantial component of the technical and scientific lexicon of English and other languages, including international scientific vocabulary. For example, bio- combines with -graphy to form biography . A vowel usually facilitates the combination: in biography, the interfix -o-, in miniskirt, the interfix -i-. This vowel is usually regarded as attached to the initial base rather than the final base , but in forms where it is conventionally stressed, it is sometimes shown as attached to the final base . If, however, the final base begins with a vowel , the mediating vowel has traditionally been avoided , but in recent coinages it is often kept, sometimes accompanied by a hyphen .