teether

From teethe +‎ -er.

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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.