tractor

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trac·tor

(trak'tŏr, tōr),
An instrument for exerting traction on an organ or structure.
[Mod. L. a drawer, see traction]
A popular term for a molecule—e.g., a carrier protein—that links to a poorly- or non-antigenic molecule—e.g., a hapten—enhancing its immunogenicity and mediating transportation through the cell or body

tractor

(trăk′tor) [L., drawer]
Any device or instrument for applying traction.