impacted tooth
Dental term for a tooth that fails to erupt properly and remains embedded in the jawbone or gum.
Impacted teeth are often discovered through X-ray examination at a dental clinic.
Compound of 埋伏 (まいふく, 'lying in ambush; being embedded') and 歯 (し, 'tooth'). The exact historical derivation is uncertain, but the term is a modern medical coinage.