trencher
 oxford
 views  updated May 21 2018trench·er1  / ˈtrenchər/ •
n. 1. hist.  a wooden plate or platter for food. ∎  a thick slice of bread used as a plate or platter.2.
old-fashioned term for mortarboard (sense 1).trench·er2  •
n. a machine or attachment used in digging trenches.
 The Oxford Pocket Dictionary of Current English 
   trencher
 oxford
 views  updated May 14 2018trencher †cutting instrument; board on which food was served XIV (hence 
t. 
-man feeder, eater XVI); (also 
t. 
-cap) academic cap thought to resemble a square platter XVIII. — AN. 
trenchour, OF. 
trencheoir, f. 
trenchier cut; see 
TRENCH, 
-ER2, 
-OR1  The Concise Oxford Dictionary of English Etymology T. F. HOAD
   trencher
 oxford
 views  updated May 21 2018trencher Medieval English; thick slices of (normally stale) bread, partly hollowed out and used as a plate, commonly given to the poor after the meal. Later replaced by a wooden trencher.
  A Dictionary of Food and Nutrition DAVID A. BENDER