TEd Remington used this word correctly over a year ago, but I don't remember seeing it then.
I just encountered it in an "engines" episode about a museum "docent" not understanding why
a spinning skater with her arms outstretched, spins faster when she brings them to her sides.

docent
n.
5Ger, earlier sp. of dozent, teacher, lecturer < L docens, prp. of docere, to teach: see DECENT6
1 in some American universities, a teacher or lecturer not on the regular faculty
2 a tour guide and lecturer, as at a museum