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medical terminology word structure combining forms prefixes suffixes examples list

The medical textbook library doesn't contain a dedicated medical terminology textbook, but I've pulled together a thorough reference from authoritative open educational sources. Here's a complete content guide for Chapter I: Etymology of Medical Terminology - Word Building and Word Structure:

Chapter I: Medical Terminology - Word Building & Word Structure

What Is Medical Terminology?

Medical terminology is the standardized language used in healthcare to describe the human body, its structures, functions, diseases, and procedures. Most medical terms originate from Greek and Latin roots, which is why understanding word parts allows you to decode thousands of unfamiliar terms without memorizing each one individually.

For example: neuroblastoma

neuro = nerves
blast = immature cell
oma = tumor/cyst

How Is Medical Terminology Constructed?

Every medical term is built from up to four components:

Component	Definition	Position
Word Root	Core meaning of the term	Middle
Combining Vowel	Usually "o" - links word parts	Between roots/suffixes
Combining Form	Root + combining vowel (e.g., cardi/o)	Middle
Prefix	Modifies meaning	Beginning
Suffix	Describes condition, procedure, or state	End

A word root + combining vowel = combining form (written with a slash, e.g., cardi/o, hepat/o)

Combining Forms (Root + Combining Vowel)

These are the building blocks of medical terms. The combining vowel (usually "o") is added to connect a root to a suffix that begins with a consonant.

Body Systems & Anatomy

Combining Form	Meaning	Example Term
cardi/o	heart	cardiology
arteri/o	artery	arteriosclerosis
angi/o	vessel	angiogram
hepat/o	liver	hepatitis
gastr/o	stomach	gastralgia
enter/o	intestine	enteritis
col/o	colon	colitis
nephro	kidney	nephrectomy
crani/o	skull	craniotomy
arthr/o	joint	arthritis
derm/o / dermat/o	skin	dermatology
cerebr/o	cerebrum	cerebrovascular accident
encephal/o	brain	electroencephalogram
bronch/o	bronchial tube	bronchitis
cyst/o	bladder/sac with fluid	cystoscope
oste/o	bone	osteoporosis
hemat/o / hem/o	blood	hematology
gynec/o	female/woman	gynecology
hyster/o	uterus	hysterectomy
ophthalm/o	eye	ophthalmology
ot/o	ear	otoscope
rhin/o	nose	rhinorrhea
cost/o	rib	intercostal
cyt/o	cell	cytology
bi/o	life	biology
carcin/o	cancer	carcinoma
glyc/o	sugar	hyperglycemia

Prefixes

Prefixes are placed at the beginning of a word to modify its meaning. They commonly indicate number, position, direction, or negation.

Negation / Absence

Prefix	Meaning	Example
a- / an-	without, lacking	anemia (without blood cells)
anti-	against	anticholinergic
contra-	against	contraception

Position & Direction

Prefix	Meaning	Example
endo-	within, inside	endoscopy
epi-	upon, above	epidermis
hypo-	below, under	hypoglycemia
hyper-	above, excessive	hypertension
intra-	within	intravenous
inter-	between	intercostal
peri-	around	pericardium
retro-	behind, backward	retroperitoneum
sub-	under	subcutaneous
supra- / super-	above	suprarenal
trans-	across, through	transdermal
para-	alongside, abnormal	parathyroid
pre-	before	precancerous
post-	after, behind	postpartum

Quantity & Number

Prefix	Meaning	Example
mono- / uni-	one	monocyte
bi- / di-	two	bilateral
tri-	three	tricuspid
quadri-	four	quadriplegia
hemi-	half	hemiplegia
pan-	all	pancytopenia
poly-	many	polycythemia

Condition-Based

Prefix	Meaning	Example
dys-	difficult, abnormal	dyspnea
eu-	good, normal	eupnea
mal-	bad, abnormal	malignant
neo-	new	neoplasm
brady-	slow	bradycardia
tachy-	fast	tachycardia

Suffixes

Suffixes are placed at the end of a word and usually indicate a condition, procedure, or anatomical relationship.

Surgical Procedures

Suffix	Meaning	Example
-ectomy	surgical removal	nephrectomy (kidney removal)
-otomy / -tomy	incision into	laparotomy (incision into abdomen)
-ostomy	creating an opening	colostomy
-plasty	surgical repair	rhinoplasty (nose repair)
-pexy	surgical fixation	orchiopexy
-rrhaphy	suturing, stitching	herniorrhaphy

Diagnostic & Imaging

Suffix	Meaning	Example
-oscopy / -scopy	visual examination	colonoscopy
-gram	record, image	electrocardiogram
-graphy	process of recording	radiography
-meter	measuring instrument	spirometer
-metry	process of measuring	spirometry

Conditions & Diseases

Suffix	Meaning	Example
-itis	inflammation	appendicitis
-osis	condition, disease process	fibrosis
-oma	tumor, swelling	carcinoma
-algia / -dynia	pain	cardialgia
-pathy	disease	neuropathy
-emia	blood condition	anemia, septicemia
-uria	urine condition	hematuria
-rrhea	discharge, flow	rhinorrhea (runny nose)
-edema	swelling, fluid accumulation	lymphedema
-plegia	paralysis	quadriplegia
-phobia	fear	claustrophobia

General / Descriptive

Suffix	Meaning	Example
-logy	study of	cardiology
-logist	specialist	cardiologist
-ia / -y	condition, state	anemia
-ism	state of, condition	hypothyroidism
-ium	structure, tissue	pericardium
-al / -ic / -ous	pertaining to	cardiac, subcutaneous
-ary / -ory	pertaining to, relating to	pulmonary

Quick Decoding Strategy

When you see an unfamiliar medical term, break it down right to left:

Identify the suffix first - it tells you what the term is (a condition, a procedure, a study)
Find the prefix (if any) - it modifies direction, quantity, or state
Interpret the root/combining form - it tells you what body part or system is involved

Example: Electroencephalography

-graphy = process of recording
encephal/o = brain
electr/o = electricity
→ "The process of recording electrical activity of the brain"

The library's textbooks don't include a dedicated medical terminology reference book, so this content draws from peer-reviewed open educational resources (The Language of Medical Terminology and Medical Terminology for Healthcare Professions). Would you like me to go deeper on any specific section, or move on to another chapter from your textbook?

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