Mesial means being in the middle or toward the middle of something, especially teeth.
Mesial is a word that dentists use to talk about where teeth are in the mouth.
Examples:
The mesial tooth is in the middle of the mouth.
The mesial side of the tooth is important for chewing.
The mesial part of the mouth is where the front teeth are.
The mesial teeth are the best for biting.
The mesial tooth is right in the middle of the mouth, not on the side.
The mesial side of the tooth is where the dentist looks first.