Brought forth in an imperfect condition; imperfectly formed or inadequately developed, as an animal or vegetable production; rudimentary.Suppressed; kept imperfect; remaining rudimentary, or not advancing to perfection in form or function: a frequent use of the term in zoölogy. Compare vestigial.Hence Not brought to completion or to a successful issue; failing; miscarrying; coming to nought: as, an abortive scheme.In botany, defective; barren. A. Gray.Producing nothing; chaotic; ineffectual.In medicine, producing or intended to produce abortion; abortifacient: as, abortive drugs.Deformed; monstrous.n. That which is produced prematurely; an abortion; a monstrous birth.n. A drug causing abortion; an abortifacient.To cause to fail or miscarry.To fail; perish; come to nought.