Introduction to Medical Terminology

Medical terminology is the language used to precisely describe the human body, its components, processes, conditions affecting it, and procedures performed upon it. Understanding the structure and formation of medical terms is essential for students entering health-related fields.

Medical Term Components

Medical terms are often constructed from multiple word parts, each contributing to the overall meaning of the term. These components include the word root, combining vowel, prefix, and suffix.

• Constructed Terms: Built from word parts or components, allowing for the creation of many terms by combining these elements.

• Eponyms: Terms derived from the names of people, not built from standard word parts (e.g., Alzheimer disease).

Word Parts and Their Functions

• Word Root: The core part of the term that contains its primary meaning (e.g., cardi for heart).

• Combining Vowel: Usually 'o', used to connect word roots or a word root and a suffix for easier pronunciation (e.g., cardi/o).

• Prefix: Added to the beginning of a word root to modify its meaning (e.g., hypo- means below).

• Suffix: Added to the end of a word root to indicate a condition, disease, procedure, or action (e.g., -itis means inflammation).

Example: Electrocardiogram = electro- (electricity) + cardi/o (heart) + -gram (record or image): a record of the heart's electrical activity.

Defining Medical Terms

To define a medical term, start with the suffix, then the prefix, and finally the word root.

• Suffix: Indicates the condition, disease, or procedure.

• Prefix: Indicates direction, position, quantity, or time.

• Word Root: Provides the core meaning.

Example: Hypoglycemia = hypo- (below) + glyc (sugar) + -emia (condition of the blood): a condition of low blood sugar.

Word Roots and Combining Forms

Word roots are the foundation of medical terms. Combining forms are created by adding a vowel to the root, making pronunciation easier when adding suffixes or other roots.

Practice Example

Which term means the study of the causes of disease? Answer: Etiology (eti/o = cause, -logy = study of)

Prefixes

Prefixes Indicating Numbers and Amounts

Prefixes can indicate numbers, sizes, or amounts. For example:

• poly-: many

• uni-: one

• bi-: two

• semi-, hemi-: half

• nulli-: none

Prefixes Indicating Qualities

These prefixes describe attributes or characteristics:

• brady-: slow

• dys-: difficult, bad, painful

• eu-: good, normal

• heter-: different

• mal-: bad

• mega-, megal-: very large

• neo-: new

• tachy-: fast

• ultra-: beyond normal

Prefixes Indicating Position and Placement

• ante-, pre-: in front of

• dorsi-, dorso-: behind

• infer-, infra-, hypo-: below

• circum-: around

• peri-: surrounding

• ep-, epi-: over, above

• ab-: away from

• ad-: toward

• ec-: outside, out

• intra-: within

• inter-: between

• para-: beside, near

• dia-: through

Suffixes

General Use Suffixes

Grammatical Suffixes: Diminutives

Diminutive suffixes indicate something small or minute.

Suffixes Indicating Pathological Conditions

Suffixes for Diagnostic and Surgical Procedures

Plural Endings in Medical Terminology

Many medical terms have singular and plural forms derived from Latin or Greek. Understanding these endings is important for accurate communication.

Example: The plural of metastasis is metastases.

Summary Table: Key Medical Word Parts

Additional info: Mastery of medical terminology enables clear and concise communication in healthcare settings, reducing errors and improving patient care.