Thryfallow

• (v. t.) To plow for the third time in summer; to trifallow.
Found on http://thinkexist.com/dictionary/meaning/thryfallow/

Thryfallow

Thry'fal`low transitive verb [ Perhaps from thrice + fallow . Confer Trifallow .] To plow for the third time in summer; to trifallow. [ R.] [ Written also thrifallow .] Tusser.
Found on http://www.encyclo.co.uk/webster/T/52
No exact match found