Ye shall not round
naqaph (naw-kaf')
to strike with more or less violence (beat, fell, corrode); by implication (of attack) to knock together, i.e. surround or circulate
the corners
pe'ah (pay-aw')
mouth in a figurative sense, i.e. direction, region, extremity -- corner, end, quarter, side.
of your heads
ro'sh (roshe)
the head (as most easily shaken), whether literal or figurative (in many applications, of place, time, rank, itc.)
neither shalt thou mar
shachath (shaw-khath')
to decay, i.e. (causatively) ruin -- batter, cast off, corrupt(-er, thing), destroy(-er, -uction), lose, mar, perish, spill, spoiler, utterly, waste(-r).
the corners
pe'ah (pay-aw')
mouth in a figurative sense, i.e. direction, region, extremity -- corner, end, quarter, side.
of thy beard
zaqan (zaw-kawn')
the beard (as indicating age) -- beard.