teether

teethe +‎ -er

teether (plural teethers)

1. A device given to infants to help soothe inflamed gums during teething, often filled with a fluid or gel that can be frozen or refrigerated.

   Hypernym: chew toy

   Hyponym: teething ring

2. One who teethes.
   • 2010, Heidi Murkoff, What To Expect The 1st Year:

     If your baby is an early or late teether now, the same is likely to be true with the second set of teeth.