"Concentrative" is a word in ENGLISH

Serving or tending to abbreviate; shortening; abridging.

Serving or tending to bind or constrict.

Pertaining to copulation; tending or serving to unite; copulative.

Serving to deprecate; tending to remove or avert evil by prayer; apologetic.

Serving to purge; tending to cleanse or purify.

Tending or serving to draw apart.

Tending or serving to distract.

Tending to distribute; serving to divide and assign in portions; dealing to each his proper share.

Serving or tending to divert; also, distinguishing.

Serving or tending to elaborate; constructing with labor and minute attention to details.

Serving or tending to emasculate.

Tending or serving to eradicate; curing or destroying thoroughly, as a disease or any evil.

Serving or tending to form an eschar; producing a scar; caustic.

Serving of tending to evacuate; cathartic; purgative.

Having power to excite; tending or serving to excite; excitatory.

Serving or tending to excite; excitative.

Serving or tending to exhaust; exhibiting all the facts or arguments; as, an exhaustive method.

Serving to unfold or explain; tending to lay open to the understanding; explanatory.

Tending or serving to expurgate; expurgatory.

Serving or tending to extort.