What does aludel mean?
The definition of aludel
Al”u*del, n.
Etym: [F. & Sp. aludel, fr. Ar. aluthal.] (Chem.)

One of the pear-shaped pots open at both ends, and so formed as to be fitted together, the neck of one into the bottom of another in succession; — used in the process of sublimation. Ure.