Definitions:

1. One of the first set of teeth in the growth development of humans and many other mammals. NOUN
   • The dentist gently extracted the loose baby tooth, leaving a tiny gap in the child's smile.
2. One of the first set of teeth that develop in young children. NOUN
   • As the baby tooth fell out, the child proudly placed it under the pillow in hopes of a visit from the Tooth Fairy.

Synonyms:

• deciduous tooth
• milk tooth
• primary tooth
• temporary tooth