(masonry) A bond in which no header stone stretches across the wall, but two headers meet in the middle, and their joint is covered by another stone laid header fashion.

(Internet) The disruptive act of posting a flood of articles to a newsgroup, the article headers having been falsified so as to make the articles appear to have been posted by people other than the...

(linguistics) A language family spoken in the northern Pyrenees.

(anatomy, surgery) Beneath an articulation or joint.