messor
/ˈmɛsɔː/noun
1A manorial official with responsibility for supervising the reapers. historical.
2 Entomology. A harvester ant of the genus Messor. Also (in form Messor): the genus itself.
Origin
Mid 17th century (in an earlier sense). From classical Latin messor a reaper, harvester from mess-, past participial stem of metere to reap, cognate with mow + -or.