mnemonical

from The Collaborative International Dictionary of English v.0.48

Mnemonic \Mne*mon"ic\ (n[-e]*m[o^]n"[i^]k), Mnemonical
\Mne*mon"ic*al\ (n[-e]*m[o^]n"[i^]*kal), a. [Gr. mnhmoniko`s,
   fr. mnh`mwn mindful, remembering, mnh`mh memory, mna^sqai to
   think on, remember; akin to E. mind.]
   Assisting in memory; helping to remember; as, a mnemonic
   device.
   [1913 Webster]