Interior Root Words

Below are the most common interior root words used in medical terminology. If you landed on this page from a web search, be sure to check out our Finding Root Words page. It contains the exterior root words.

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Medical Terminology – Interior Root Words
abdomin/oabdomen
aden/ogland
adren/oadrenal gland
alveoli/iair sac
appendic/oappendix
angi/ovessel
arteri/oartery
athr/ojoint
atri/oatrium
audi/ohearing
balan/glans penis
biolife
bronch/i or bronchobronchus
bronchiol/obronchiole
carcin/ocancer
cardi/oheart
cellul/ocell
cerebell/ocerebellum
cerebr/i or cerebrocerebrum
chol/ebile
cholecyst/ogallbladder
choledoch/ocommon bile duct
chondr/i or chondrocartilage
chrom/ocolor
col/ocolon
colp/ovagina
cost/orib
cry/ocold
crypt/ohidden
cutane/oskin
cyan/oblue
cysti, cyst or cystobladder or cyst
cyt/ocell
dipl/odouble or twice
duoden/oduodenum
encephal/obrain
enter/ointestine
episi/ovulva
erythr/ored
esophag/oesophagus
fibr/ofibers
galact/omilk
gastr/ostomach
glyc/osugar
gynec/ofemale
hemat/oblood
hepat/o or hepatic/oliver
heter/oother or different
hidr/osweat
hist/o or histi/otissue
hom/o or home/osame or alike
hydr/owater or wet
hyster/outerus
latr/otreatment
lle/olleum or intestine
lli/ollium or pelvic bone
intestin/ointestine
jejun/ojejunum
kerat/ocornea of eye or horny tissue
lacrimatears
laryng/olarynx
leuk/owhite
lipid/ofat
lith/ostone in gallbladder or kidney
lymph/olymph vessels
melan/oblack
men/omenses or menstruation
mening/omeninges
metra/a or metrouterus
my/omuscle
myel/obone marror or spinal cord
myring/oeardrum
nat/obirth
necr/odeath
nephr/okidney
neur/onerve
oophor/oovary
orchid/o or orchi/otestis
oss/eo, ossi, ost, or osteobone
palat/oroof of mouth
path/odisease
peritone/operitoneum
pharmac/odrug
pharyng/opharynx
phleb/ovein
phren/odiaphragm
pleur/opleura or side rib
pheum/a or pheumolungs
poli/ogray matter of the nervous system
proct/orectum or anus
pulmon/olungs
py/opus
pyel/opelvis of kidney
rect/orectum
ren/i or renokidney
sarc/oflesh
scapul/oscapula
sept/oinfection
splen/ospleen
spondyl/overtebra
stern/osternum
tend/o or tenotendon
testicul/otestis
therm/oheat
thorac/ochest
thym/othymus
thyr/othyroid gland
thyroid/othyroid gland
tonsill/otonsils
trache/otrachea
tympan/oeardrum
ur/e, urea, urin, urino, ur or urourine
ureter/oureter
urehtro/ourethra
vas/ovash deferens
vas/o or ven/ovein
vesic/obladder
viscer/oviscera
xanth/ored or redress
xer/odry

We’ve included a free printable version of the above list. Click here for our printable list of Interior Root Words. Once the list opens you will be able to print it.

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