1. (v. t.) To make thin or fine; to make less gross or coarse.

2. (v. t.) To refine; to spin into niceties; as, to subtilize arguments.

3. (v. i.) To refine in argument; to make very nice distinctions.

adulterate analyze attenuate contradistinguish cut demarcate demark dematerialize differentiate dilute discriminate disembody distinguish divide draw the line emacerate emaciate enervate etherealize expand mark the interface pick out rarefy sap screen screen out segregate select separate set a limit set apart set off sever severalize sieve sieve out sift sift out sort sort out spiritualize split hairs subdivide thin thin away thin down thin out water water down weaken winnow