Definition

1. Noun:
   • A chalky deposit of sodium urate: A concretion or incrustation, primarily composed of uric acid salts (urates), that forms in tissues, particularly around joints or in the external ear, characteristic of advanced or chronic gout.
   • A hard deposit on teeth: A calcified concretion, such as dental calculus or tartar, that forms on the teeth and gums.

Usage Examples

• Noun (Medical - Gout):
  • The doctor identified the painful nodule on his elbow as a tophus, confirming the progression of his gout.
  • Chronic gout can lead to the formation of tophi, which may cause joint deformity.
• Noun (Dental):
  • The dental hygienist removed the stubborn tophus from the patient's lower incisors during the cleaning.

Advanced Usage

• "Tophaceous" (Adjective): Describing a condition characterized by or resembling a tophus or tophi.
  • The patient presented with tophaceous gout, requiring aggressive management.
• Medical Diagnosis: The presence of a tophus is a pathognomonic sign, meaning it is specifically diagnostic for advanced or chronic gouty arthritis.

Variants and Related Words

• Tophi (n): The plural form of .
  • Multiple tophi were visible on his fingers and ears.
• Tophaceous (adj): Pertaining to or of the nature of a tophus.
  • The X-ray revealed tophaceous deposits in the joint space.

Synonyms

• Gouty deposit: A deposit caused by gout.
• Chalkstone: An informal, descriptive term for a tophus, referencing its chalky appearance.
• Calculus (in a dental/medical context): A hard, stony concretion. (Note: "Calculus" is a broader term that can refer to stones in various organs, not exclusively urate deposits.)

Notes on Meaning

The word tophus has two distinct medical applications: 1. In Rheumatology: It almost exclusively refers to the urate crystal deposits associated with gout. 2. In Dentistry: It is a more technical or historical term for dental calculus (tartar), which is a different type of calcified deposit. In modern common usage, the gout-related meaning is predominant.

Noun

1. an incrustation that forms on the teeth and gums
2. a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout