Meaning of BALLAST in English

BALLAST

[ 'baləst ]

■ noun

1》 a heavy substance, such as gravel or lead, placed in the bilge of a ship to ensure its stability.

↘a substance carried in an airship or on a hot-air balloon to stabilize it.

2》 gravel or coarse stone used to form the bed of a railway track or the substratum of a road.

↘a mixture of coarse and fine aggregate for making concrete.

3》 a passive component used in an electric circuit to moderate changes in current.

■ verb provide with ~.

Origin

C16: prob. of Low Ger. or Scand. origin.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.