rec·to 
(rĕktō)
(rĕktō)n. pl. rec·tos
A right-hand page of a book or the front side of a leaf, on the other side of the verso.
[From Latin (foliō) rēctō, (the leaf) being right, ablative of rēctus, straight, right; see reg- in the Appendix of Indo-European roots.]
- spectro-
- spectrogram
- spectrograph
- spectrographic
- spectrographically
- spectrography
- spectroheliogram
- spectroheliograph
- spectroheliographic
- spectroheliography
- spectrohelioscope
- spectrohelioscopic
- spectrometer
- spectrometric
- spectrometry
- spectrophotometer
- spectrophotometric
- spectrophotometry
- spectroscope
- spectroscopic
- spectroscopical
- spectroscopically
- spectroscopic analysis
- spectroscopic binary
- spectroscopist