The tendency of two bodies to approach each other. [L. at-traho, pp. -tractus, to draw toward]
capillary a. the force that causes fluids to rise up very fine tubes or through the pores of a loose material.
chemical a. the force impelling atoms of different elements or molecules to unite to form new substances or compounds.
magnetic a. the force that draws iron or steel toward a magnet.
neurotropic a. the pull of a regenerating axon toward the motor end-plate.
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