spectro- /spek-trō- or -tro-/

1. Signifying: spectre
2. Spectrum

• reading ages
• reading-book
• reading-books
• reading-boy
• reading-boys
• reading-desk
• reading-desks
• reading group
• reading-lamp
• reading-lamps
• reading-machine
• reading-machines
• reading matter
• reading matters
• reading microscope
• reading-room
• reading-rooms
• readings
• reading telescope
• read-ins
• read into
• readjust
• readjusted
• readjusting
• readjustment