Doctor (डॉक्टर)
The term for a medical professional who diagnoses and treats illnesses or injuries.
आपको किस तरह की तकलीफ है, डॉक्टर से पूछें। (Ask the doctor what kind of problem you are experiencing.)

Medicine (दवाई)
Any substance used to treat or prevent disease.
मुझे यह दवाई दिन में दो बार लेनी है। (I have to take this medicine twice a day.)

Prescription (प्रिस्क्रिप्शन)
A written order from a doctor for the administration of a medicine or treatment.
कृपया यह प्रिस्क्रिप्शन दवाखाने में दिखाएं। (Please show this prescription at the pharmacy.)

Hospital (अस्पताल)
An institution providing medical and surgical treatment and nursing care for sick or injured people.
उसे तुरंत अस्पताल ले जाना होगा। (He needs to be taken to the hospital immediately.)

Patient (रोगी)
A person receiving or registered to receive medical treatment.
रोगी को आराम की आवश्यकता है। (The patient needs rest.)

Surgery (शल्य चिकित्सा)
A procedure, typically involving an incision, to repair or remove a part of the body.
उसे कल शल्य चिकित्सा से गुजरना पड़ा। (He had to undergo surgery yesterday.)

Pharmacy (दवाखाना)
A place where medicines are compounded or dispensed; a drugstore.
कृपया अपनी दवाइयाँ नजदीकी दवाखाने से ले लें। (Please collect your medicines from the nearest pharmacy.)

Emergency (आपातकालीन)
A serious, unexpected, and often dangerous situation requiring immediate action.
आपातकालीन स्थिति में, इस नंबर पर कॉल करें। (In case of an emergency, call this number.)

Injection (इंजेक्शन)
A shot administered with a needle to deliver medication or vaccination.
डॉक्टर ने दर्द निवारक के लिए इंजेक्शन दिया। (The doctor gave an injection for pain relief.)

Thermometer (थर्मामीटर)
An instrument for measuring and indicating temperature.
थर्मामीटर से बुखार का पता चलता है। (The thermometer indicates fever.)

Painkiller (दर्द निवारक)
A drug or medicine for relieving pain.
उसे दर्द निवारक दवाई दी गयी है। (She has been given a painkiller.)

X-ray (एक्स-रे)
A type of radiation used to create images of the inside of the body.
आपके पैर का एक्स-रे कराना होगा। (You will have to get an x-ray of your leg.)

Vaccine (टीका)
A biological preparation that provides active acquired immunity to a particular infectious disease.
क्या आपने फ्लू का टीका लगवाया है? (Have you received the flu vaccine?)

Diagnosis (निदान)
The identification of the nature of an illness or other problem by examination of the symptoms.
डॉक्टर ने मुझे जो निदान दिया, वो सही था। (The diagnosis given to me by the doctor was correct.)

This glossary of medical terms in Hindi should aid you in a healthcare scenario where knowing the local language is beneficial. Such terms are not only useful for communication but also for understanding prescriptions, instructions, and diagnosis in a medical setting. Always remember, proficient communication in healthcare can significantly improve the care and comfort of the patient.