Merriam-Webster Collegiate Dictionary - trencher

 I. noun  Etymology: Middle English trenchour knife, serving platter, from Anglo-French, from ~ to cut  Date: 14th century a wooden platter for serving food  II. adjective  Date: 14th century  1. of or relating to a ~ or to meals  2. archaic having the nature of a parasite ; sycophantic  III. noun  Etymology: 2trench  Date: 1851 one that digs trenches; specifically a usually self-propelled excavating machine typically employing a bucket conveyor and used to dig trenches especially for pipelines and cables