lacrimation

/ˌlækrəˈmeɪʃən/
noun
  1. The production of tears, especially excessive or involuntary tearing of the eyes.
    • Chopping onions often causes lacrimation due to the irritating fumes.
    • Strong wind can cause lacrimation, making it hard to see clearly.
    • The eye doctor checked the patient for abnormal lacrimation.