noun
caltrop; caltrap
A historical spiked device scattered on the ground to hinder infantry and cavalry; used in feudal Japan. The term is primarily encountered in historical or martial contexts.
忍びの者は逃げるときに撒菱をまいた。
The ninja scattered caltrops as they fled.
博物館で撒菱の実物を見た。
I saw an actual caltrop at the museum.