1
a(1)
: a gauge, pattern, or mold (such as a thin plate or board) used as a guide to the form of a piece being made
(2)
: a molecule (as of DNA) that serves as a pattern for the generation of another macromolecule (such as messenger RNA)
b
2
: something that establishes or serves as a pattern
3
: a short piece or block placed horizontally in a wall under a beam to distribute its weight or pressure (as over a door)
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Merriam-Webster unabridged
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