[landscapegwj]

I think xylene is my favorite.And toluene is pretty good.

[Kryolith]

not beautiful, but hard to pronounce: pseudopelletierine, susceptibility, 2-pyrrolidinylpyridine
funny: piranha solution

[Alpha-Omega]

SYMMETRY,,,,Symmetry is the most beautiful word in CHEMISTRY..

[0000000]

I suppose for the non-chemists all the organic names are frightening and because of that are beautiful.

It's hard to chose a beautiful word, oh quick silver sounds nice

[Arkcon]

I have two favorites, they are English words, borrowed from German, so in Germany, I guess they're dull:

zwitterion - a great way to improve a HPLC separation, and an accurate description of the amino acids.  So much fun to say, "Use the ion"  "Which ion"  "Das ZWITTERION"

Bremsstrahlung - I don't get to use this as much.  "So I'll just pack this beta-emitting radionucleotide in a lead box."  "Brilliant, you never heard of
Bremsstrahlung, have you?"

[MPC]

umpolung.