the GNU version of the Collaborative International Dictionary of English
n. One who explains or elucidates; an expositor.
The Century Dictionary and Cyclopedia
n. One who elucidates or explains; an expositor.
Word Usage
"The indispensible 11th Century elucidator Rabbi Shlomo Yitzchaki Rashi explained that he gave them spiritual gifts -- knowledge that they would need for their journey."