Boyd’s Bible Dictionary:
(horned). Grain-field corners not allowed to be wholly reaped (Lev. 19:9; 23:22). “Legal corner,” one sixtieth of the field. “Length and breadth” of a country (Num. 24:17; Jer. 48:45). “Cornerstone,” chief stone in a foundation (Job 38:6). Figuratively (Isa. 28:16; Matt. 21:42).