唾液

1. Origins, structure, and basic meaning

• Structure: Written 唾液 and read だえき, it is the fluid secreted in the mouth that assists eating and reflects oral physiology.
• Basic usage: It is discussed when chewing increases its flow and when a swab collects a sample for testing.

2. Common pitfalls and similar expressions

• A technical term for spit
  • It refers to the same substance as the everyday word, but is standard in medical and physiological contexts.