Artificial intelligent assistant

perpender

ˈperpender Masonry. Obs.
  [f. perpend, parpen + -er1.]
  = parpen.

1611 Cotgr., Perpins, perpenders, or perpent stones; stones made iust as thick as a wall, and shewing their smoothed ends on either side thereof. 1755 in Johnson [erroneously explained as ‘a coping stone’].


Oxford English Dictionary

yu7NTAkq2jTfdvEzudIdQgChiKuccveC 5a3a48b5bf5e753a5ea6defbd761c4b0