ballast
/ˈbæl.əst/ noun, verb
Forms ballasts ballasting ballasted
- noun (nautical) Heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability.
- noun (figurative) Anything that steadies emotion or the mind.
- noun Coarse gravel or similar material laid to form a bed for roads or railroads, or in making concrete; track ballast.
- noun (construction) A material, such as aggregate or precast concrete pavers, which employs its mass and the force of gravity to hold single-ply roof membranes in place.
- noun (railways) Loose stone or big gravel used to hold rails and tracks in place.
- noun (countable, electricity, electronics) device used for stabilizing current in an electric circuit (e.g. in a tube lamp supply circuit)
- noun (figurative) That which gives, or helps to maintain, uprightness, steadiness, and security.
- verb (transitive) To stabilize or load a ship with ballast.
- verb (transitive) To lay ballast on the bed of a railroad track.
- verb (transitive) To weigh down with a ballast.
Synonyms
Etymology
From Middle English bar (“bare”) + last (“load”).
Webster’s 1913
- noun Any heavy substance, as stone, iron, etc., put into the hold to sink a vessel in the water to such a depth as to prevent capsizing.
- noun Any heavy matter put into the car of a balloon to give it steadiness.
- verb To steady, as a vessel, by putting heavy substances in the hold.
- verb To fill in, as the bed of a railroad, with gravel, stone, etc., in order to make it firm and solid.
Etymology [D. ballast; akin to Dan. baglast, ballast, OSw. barlast, Sw. ballast. The first part is perh. the same word as E. bare, adj.; the second is last a burden, and hence the meaning a bare, or mere, load. See Bare, a., and Last load.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “ballast”, CC BY-SA 4.0. Details