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ballast

bal·last

ballast

 
pronunciation:
bae lihst
features:
Word Explorer
part of speech: noun
definition 1: heavy material placed in a boat or ship to make it more stable.
There was little cargo and not enough ballast to keep the ship from rocking fiercely in the storm.
definition 2: heavy material placed in the car of a balloon to make it more stable.
Sand bags were used as ballast for the balloon.
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  boat