The suffix -graph means

• A. Written, recording
• B. Knowledge
• C. Tongue
• D. Glucose

Answer: (A)

The main idea here is what the suffix -graph conveys in medical terms: it signals writing or recording. The Greek root graphein means to write, so terms ending in -graph refer to something that writes, records, or a device that records. For example, radiograph is an image produced by capturing X-rays, and a cardiograph or electrocardiograph is a device that records heart activity. The other possibilities don’t fit because they come from roots that mean knowledge (gnosis), tongue (glossa), or sugar (glucose), not writing or recording.