Chapter 3: Understanding Prefixes, Suffixes, and Roots in Medical Terminology

Introduction to Prefixes in Medical Terminology

Prefixes are word parts added to the beginning of medical terms to modify their meaning. Understanding common prefixes is essential for interpreting and constructing medical vocabulary. Prefixes often indicate location, number, time, or status.

• a-: without, absence of Example: apnea (absence of breathing)

• ab-: away from Example: abduction (movement away from the midline)

• ad-: toward Example: adduction (movement toward the midline)

• ana-: up, toward Example: anabolism (building up of substances in the body)

• ante-: before Example: antenatal (before birth)

• ambi-: both Example: ambidextrous (able to use both hands equally)

• bi-: two Example: bicuspid (having two points or cusps)

• brady-: slow Example: bradycardia (slow heart rate)

• circum-: around Example: circumoral (around the mouth)

• con-: with, together, or jointly Example: congenital (present at birth, formed together)

• contra-: counter or against Example: contraceptive (against conception)

• dia-: through Example: dialysis (separation through a membrane)

• dis-: away Example: dislocation (away from normal position)

• dys-: bad, abnormal, painful, or difficult Example: dysfunction (abnormal function)

• ecto-: outside, out Example: ectoderm (outer layer of cells in embryo)

• endo-: within Example: endoscope (instrument to view within)

• exo-: outside, away from Example: exocrine (secreting outside)

• eso-: inward Example: esotropia (inward turning of the eye)

• eu-: normal/good Example: eupnea (normal breathing)

• hemi-: half Example: hemiplegia (paralysis of one side of the body)

• heter/o-: different Example: heterogeneous (composed of different elements)

• hyper-: excessive, abnormally high, above Example: hypertension (high blood pressure)

• hypo-: deficient, abnormally low, below Example: hypoglycemia (low blood sugar)

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

• inter-: between Example: intercostal (between the ribs)

• mal-: bad Example: malnutrition (bad nutrition)

• macro-/micro-: large/small Example: macrocyte (large cell), microcyte (small cell)

• megalo-: large, great Example: megaloblast (large immature cell)

• mono-/uni-: one Example: monocyte (single cell), unilateral (one side)

• neo-: new Example: neoplasm (new growth, tumor)

• nulli-: none Example: nullipara (woman who has never given birth)

• pan-: all Example: pandemic (affecting all people)

• para-: alongside, abnormal Example: parathyroid (alongside the thyroid gland)

• peri-: around Example: pericardium (membrane around the heart)

• poly-/multi-: excessive, over, or many Example: polyuria (excessive urination), multinucleated (many nuclei)

• post-: to follow after Example: postoperative (after surgery)

• pre-: to come before Example: prenatal (before birth)

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

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

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

• semi-: half; partial Example: semilunar (half-moon shaped)

• sub-: under, beneath, below Example: subcutaneous (under the skin)

• supra-/super-: above Example: suprarenal (above the kidney), superior (above another structure)

• syn-/sym-: together, joined Example: syndactyly (joined fingers or toes), symbiosis (living together)

• tachy-: fast Example: tachycardia (fast heart rate)

• tetra-: four Example: tetraplegia (paralysis of four limbs)

• trans-: through, across, or beyond Example: transdermal (across the skin)

• ultra-: beyond normal Example: ultrasound (beyond the range of normal sound)

• meta-: after, change Example: metastasis (change of location, spread of disease)

• intra-: within Example: intravenous (within a vein)

Common Suffixes in Medical Terminology (Chapter 3 Focus)

Suffixes are word parts added to the end of medical terms to modify their meaning. They often indicate procedures, conditions, or diseases. Some suffixes can have different meanings depending on their use as a prefix or suffix.

• -lysis: dissolve, loosen Example: hemolysis (destruction of red blood cells)

• -tropia: condition of turning Example: esotropia (inward turning of the eye)

• -opia: condition of vision Example: myopia (nearsightedness)

• -partum/-para: birth Example: postpartum (after birth), nullipara (woman who has never given birth)

• -pnea: breath Example: apnea (absence of breathing)

Note: The meaning of "para" differs when used as a prefix (alongside, abnormal) versus as a suffix (birth).

Common Roots in Medical Terminology (Chapter 3 Focus)

Roots are the core part of a medical term, providing its fundamental meaning. Understanding roots helps in deciphering complex terms.

• gravid-: pregnant Example: primigravida (woman pregnant for the first time)

• nat-: birth Example: neonatal (pertaining to newborns)

• tom-: cut Example: anatomy (to cut up, study of body structure); -tomy (to cut, as in lobotomy)

• kinesi-: motion Example: kinesiology (study of movement)

Table: Selected Prefixes, Suffixes, and Roots

Summary

• Prefixes, suffixes, and roots are essential components of medical terms.

• Prefixes usually indicate location, number, or time; suffixes often describe conditions or procedures; roots provide the core meaning.

• Understanding these elements allows for accurate interpretation and construction of medical vocabulary.

Additional info: Some examples and explanations were expanded for clarity and academic completeness.