礌石

léishí
(old) rocks that can be dropped from a height onto an attacking enemy

CEDICT

old

Entry Composition

1 礌 léi
  1. used in 礌石 léishí
  2. Taiwan pr. lèi
2 石 shí
  1. rock
  2. stone
  3. stone inscription
  4. one of the eight categories of ancient musical instruments 八音 bāyīn