Etymology
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drywall (n.)

"plasterboard, sheetrock; gypsum-based manufactured panel used in interior construction," by 1952, from dry (adj.) + wall (n.). Earlier dry wall meant "a wall built without mortar" (1778).

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Definitions of drywall

drywall (n.)
a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses;
Synonyms: wallboard / dry wall
From wordnet.princeton.edu