Chapter 1: Introduction to Medical Terminology – Word Roots and Combining Forms

Introduction to Medical Terminology

Word Roots

The word root is the fundamental part of a medical term, providing its core meaning. Word roots often refer to a body system or anatomical structure. Understanding word roots is essential for interpreting medical terms.

• Definition: The basic part of a word that indicates the main meaning, often a body part or system.

• Example: cardi refers to the heart.

• Application: Word roots are combined with prefixes and suffixes to form complete medical terms.

Combining Vowel and Combining Form

A combining vowel (usually 'o') is used to connect word roots to suffixes or other word roots, making terms easier to pronounce. The combining form is the word root plus its combining vowel, written as root/vowel (e.g., cardi/o).

• Combining Vowel Usage:

  • Used between a word root and a suffix if the suffix begins with a consonant.

  • Not used if the suffix begins with a vowel.

  • Always used between two word roots, even if the second root begins with a vowel.

• Examples:

  • arthr + -scope → arthroscope (combining vowel used)

  • arthr + -itis → arthritis (combining vowel not used)

  • gastr + enter + -itis → gastroenteritis (combining vowel kept between roots)

Breaking Down Medical Terms

Medical terms are constructed from components: prefix, word root/combining form, and suffix. Learning to analyze these parts helps in understanding and memorizing terminology.

• Strategy: Break down unfamiliar terms into their components to deduce meaning.

• Example: nephrology = nephr (kidney) + -ology (study of).

Common Combining Forms

The following table lists frequently used combining forms, their meanings, and examples of medical terms.

Combining Form	Meaning	Example (Definition)
bi/o	life	biology (study of life)
carcin/o	cancer	carcinoma (cancerous tumor)
cardi/o	heart	cardiology (study of the heart)
chem/o	chemical	chemotherapy (treatment with chemicals)
cis/o	cut	incision (process of cutting into)
dermat/o	skin	dermatology (study of skin)
enter/o	small intestine	enteric (pertaining to the small intestine)
gastr/o	stomach	gastric (pertaining to the stomach)
gynec/o	female	gynecology (study of females)
hemat/o	blood	hematic (pertaining to blood)
immun/o	protection	immunology (study of protection/immunity)
laryng/o	larynx	laryngeal (pertaining to the voice box)
neur/o	nerve	neurology (study of nerves)
nephr/o	kidney	nephrology (study of the kidney)
ophthalm/o	eye	ophthalmic (pertaining to the eye)
ot/o	ear	otic (pertaining to the ear)
path/o	disease	pathology (study of disease)
pulmon/o	lung	pulmonary (pertaining to the lungs)
rhin/o	nose	rhinoplasty (surgical procedure of the nose)

Examples of Medical Specialties

• Cardiology: Study of the heart

• Gastrology: Study of the stomach

• Dermatology: Study of the skin

• Ophthalmology: Study of the eye

• Nephrology: Study of the kidney

• Hematology: Study of blood

• Gynecology: Study of the female reproductive system

• Neurology: Study of nerves

• Pathology: Study of disease

Summary Table: Word Roots and Their Meanings

Body System/Part	Word Root/Combining Form	Medical Specialty
Heart	cardi/o	Cardiology
Stomach	gastr/o	Gastrology
Skin	dermat/o	Dermatology
Eye	ophthalm/o	Ophthalmology
Kidney	nephr/o	Nephrology
Blood	hemat/o	Hematology
Female	gynec/o	Gynecology
Nerve	neur/o	Neurology
Disease	path/o	Pathology

Additional info:

• Learning medical terminology by understanding word roots and combining forms allows students to interpret unfamiliar terms efficiently.

• Mastery of these basics is foundational for all subsequent chapters in medical terminology.