counterpoise
n.
early 15c., from Old French contrepois (Modern French contrepoids), from contre- "against" (see contra-) + peis, from Latin pensum "weight," noun use of neuter past participle of pendere "to weigh" (see pendant).
〔李〕[counter-=against 对抗；poise（peis）=weight 重量 ⇒“a weight against another 与另一重量相抗衡的重量”→] n. weight or force balancing another平衡力，抵消力