KGT p. 28: The standard word for this prominent part of Klingon anatomy isQuch, and this word is found with this meaning throughout the Empire. Inaddition, however, practically every dialect has its own alternate word for"forehead." […] The word tuqvol may contain the word tuq ("house [lineage]")because family resemblances can be seen in forehead ridges. The second element,vol, however, is otherwise unknown.