v. Obs. rare–1. [a. OF. assubtiller, -ier, refash. form of assoutiller, -ier, cogn. with It. assottigliare, f. Latin type *adsubtīliāre, f. ad- to + subtīlis SUBTLE.] To subtilize.
1589. Puttenham, Eng. Poesie, I. iii. (Arb.), 23. Much abstinence … assubtiling and refining their spirits.
