411 REFERENCE · Wiktionary
Frankfurt plane
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Established in 1884 at the World Congress on Anthropology in Frankfurt, Germany.
Noun
en anatomy The anatomical position of the human skull, based on a plane passing through the inferior margin of the left orbit and the upper margin of each ear canal or external auditory meatus.