The Oxford Thesaurus An A-Z Dictionary of Synonyms - offshootn.

1) branch, spur; shoot, limb, bough, twig, stem, appendage, sucker, sprout, sprig, tendril, scion: There is an offshoot of this road that goes up the hill. The offshoots are trained to grow along the arms of the espalier. 2) descendant, relation, relative, kin, kindred, offspring, scion, heir: One offshoot of the family later emigrated to the United States. 3) outgrowth, development, branch, spin-off; by-product, derivative: An offshoot of the company manufactures optical instruments. The sale of gravel for concrete is an offshoot of our mining operations.