Attenuating

ppl. a. [f. as prec. + -ING².] Making thinner; in Med. = ATTENUANT a.

1616.  Surfl. & Markh., Countr. Farm, 552. Such as haue need of a fine and attenuating nourishment.

1822.  Burrowes, Cycl., II. 550/1. Caryophyllaceæ … are reckoned astringent, attenuating and detersive.