kermes /kûrˈmēz/

1. The female bodies of a coccus insect (Kermes (or Coccus) ilicis), used as a red dyestuff
2. The oak (kermes oak; Quercus coccifera) on which they breed
3. A cherry-red mineral, antimony oxysulphide (also kermes mineral or kerˈmesite)

• on a small scale
• on a string
• on a time
• on average
• on a wing and a prayer
• on bail
• on balance
• on behalf of
• on bended knee
• on board
• on-board
• onboard
• ONC
• on call
• on camera
• once
• once-accented
• once again
• once and again
• once and for all
• once bitten, twice shy
• once-errand
• once for all
• once-for-all
• once in a blue moon