Prefixes Indicating Diseases or Abnormal Conditions

Overview

Prefixes are essential components of medical terminology, often used to modify root words and convey specific meanings related to diseases or abnormal conditions. Understanding these prefixes helps in interpreting medical terms accurately.

• a-: Without Example: aphasia (without speech)

• an-: Without Example: anoxia (without oxygen)

• anti-: Against Example: antibiotic (against life)

• brady-: Slow Example: bradycardia (slow heartbeat)

• de-: Without Example: dehydration (without water)

• dys-: Painful, difficult, abnormal Example: dyspnea (difficulty breathing)

• pachy-: Thick Example: pachyderma (thick skin)

• pseudo-: False Example: pseudocyesis (false pregnancy)

• tachy-: Fast Example: tachycardia (fast heartbeat)

Prefixes Indicating Directions or Body Positions

Overview

Directional and positional prefixes describe the location or orientation of structures in the body. These prefixes are commonly used in anatomical and procedural terminology.

• ante-: In front of Example: anteorbital (in front of eye socket)

• endo-: Within, inner Example: endoscope (instrument for viewing within)

• epi-: Above Example: epigastric (above stomach)

• ex-: Outward Example: exophthalmos (eyes outward)

• hypo-: Below Example: hypogastric (below the stomach)

• infra-: Below Example: infraorbital (below the eye socket)

• in-: Inward Example: inhalation (to breathe inward)

• inter-: Between Example: intervertebral (between vertebrae)

• intra-: Within Example: intravenous (inside vein)

• para-: Beside, two like parts of a pair Examples: paranasal (beside the nose); paraplegia (paralysis of two like parts of a pair [the legs])

• peri-: Around Example: periodontal (around tooth)

• retro-: Behind Example: retroperitoneal (behind the peritoneum)

• sub-: Under Example: subcutaneous (under skin)

• supra-: Above Example: suprapubic (above pubic bone)

• trans-: Across Example: transurethral (across urethra)

Prefixes Indicating Numbers or Quantity Measurements

Overview

Numerical and quantitative prefixes specify the number or amount involved in a medical term. These are important for describing conditions, procedures, or anatomical features.

• bi-: Two Example: bilateral (two sides)

• di-: Two Example: diplegia (paralysis of two extremities)

• hemi-: Half Example: hemiplegia (paralysis of one side [half] of body)

• hyper-: Excessive Example: hyperemesis (excessive vomiting)

• hypo-: Insufficient Example: hypocalcemia (insufficient calcium in blood)

• micro-: Small Example: microscope (instrument for viewing small things)

• mono-: One Example: monoplegia (paralysis of one extremity)

• multi-: Many Example: multigravida (more than one pregnancy)

• nulli-: None Example: nulligravida (no pregnancies)

• pan-: All Example: pansinusitis (inflammation of all sinuses)

• poly-: Many Example: polyarteritis (many inflamed arteries)

• primi-: First Example: primigravida (first pregnancy)

• quadri-: Four Example: quadriplegia (paralysis of all four extremities)

• tri-: Three Example: triplegia (paralysis of three extremities)

• ultra-: Excess Example: ultrasound (excess [high] sound wave frequency)

• uni-: One Example: unilateral (one side)

Prefixes Indicating Time

Overview

Time-related prefixes are used to indicate when an event occurs relative to another, such as before, after, or new.

• ante-: Before Example: antepartum (before birth)

• neo-: New Example: neonate (newborn)

• post-: After Example: postpartum (after birth)

• pre-: Before Example: premenstrual (before menstruation)

General Prefixes

Overview

General prefixes are used in a variety of medical terms to indicate self, normal, difference, sameness, or passage through.

• auto-: Self Example: autograft (graft from one’s own body)

• eu-: Normal Example: eupnea (normal breathing)

• hetero-: Different Example: heterograft (graft from a different species)

• homo-: Same Example: homograft (graft from the same species)

• per-: Through Example: percutaneous (through skin)

Comparison Table: Prefixes and Their Meanings

The following table summarizes the main prefixes, their meanings, and examples for quick reference.

Key Points for Exam Preparation

• Prefixes modify the meaning of medical root words and are critical for understanding medical terminology.

• Prefixes can indicate disease, abnormal conditions, direction, position, number, quantity, time, or general characteristics.

• Learning common prefixes and their meanings helps decode complex medical terms.

• Examples provided illustrate how prefixes are used in real medical contexts.