canalphones
n.pl.— «As more and more people own iPods, Zens, and Zunes, and use those players in noisy environments, in-ear-canal headphones—commonly known as “canalphones” or “in-ear monitors”—have become increasingly popular.» —“In-ear-canal headphone primer” by Dan Frakes Playlist Jan. 30, 2007. (source: Double-Tongued Dictionary)