Final answer:
Pain is a symptom of discomfort or distress, while dys- indicates a condition of impaired function. Dacryo- is associated with tear-producing glands or structures.
Step-by-step explanation:
Pain: The condition of pain, known as dynia, refers to a symptom or sensation of discomfort or distress. For example, dyspnea is the medical term for difficulty in breathing and dysuria refers to pain or discomfort experienced during urination.
Dys-: The prefix dys- is used in medical terminology to indicate a condition or state of abnormal or impaired function. For instance, dysentery is an inflammatory disorder of the intestines characterized by severe diarrhea.
Dacryo-: The prefix dacryo- is derived from the Greek word for tears and is associated with tear-producing glands or structures. An example is dacryocystitis, which is the inflammation of the tear ducts.