ca·nal·phone 
(kə-nălfōn′)
(kə-nălfōn′)n.
A headphone that fits inside the ear canal and is designed to block ambient noise.
- spectral line
- spectrally
- spectralness
- spectre
- spectrin
- spectro-
- spectrogram
- spectrograph
- spectrographic
- spectrographically
- spectrography
- spectroheliogram
- spectroheliograph
- spectroheliographic
- spectroheliography
- spectrohelioscope
- spectrohelioscopic
- spectrometer
- spectrometric
- spectrometry
- spectrophotometer
- spectrophotometric
- spectrophotometry
- spectroscope
- spectroscopic