Abortive, a.
Etymology: [L. abortivus, fr. aboriri. See Abort, v.]
1. Produced by abortion; born prematurely; as, an abortive child. [R.]
2. Made from the skin of a still-born animal; as, abortive vellum. [Obs.]
3. Rendering fruitless or ineffectual. [Obs.] "Plunged in that abortive gulf." Milton.
4. Coming to naught; failing in its effect; miscarrying; fruitless; unsuccessful; as, an abortive attempt. "An abortive enterprise." Prescott.
3 more senses
5. (Biol.)
Imperfectly formed or developed; rudimentary; sterile; as, an abortive organ, stamen, ovule, etc.
6. (Med.) (a) Causing abortion; as, abortive medicines. Parr. (b) Cutting short; as, abortive treatment of typhoid fever.
1 other Webster entry under this spelling
Abortive, n.
1. That which is born or brought forth prematurely; an abortion. [Obs.] Shak.
2. A fruitless effort or issue. [Obs.]
3. A medicine to which is attributed the property of causing abortion. Dunglison.
Shades of meaning
Fernald has no entry of its own for abortive; he lists it under vain.
Where he writes about it:
That which is bootless, fruitless, or profitless fails to accomplish any valuable result; that which is abortive, ineffectual, or unavailing fails to accomplish a result that it was, or was supposed to be, adapted to accomplish. — from vain