Welcome to NewMedicalTerms, your ultimate guide to the explanations and definitions of the majority of medical terms you may see.

Singular versus plural rules:

Alphabetical Listing of Med Terms


Also check out the medical abbreviations section

Rule one:

Terms that end in “a”, for plural add an “e”. Example: vertebra (singular), vertebrae (plural).

Rule Two:

Terms that end in “is”, for plural change it to “es”. Example: diagnosis (singular), diagnoses (plural)

Rule Three:

Terms that end in “ex” or “ix” for plural replace with “ices”. Example: cervix (singular), cervices (plural)

Rule Four:

Terms that end in “on” for plural replace it with “a”. Example: criterion (singular), criteria (plural)

Rule Five:

Terms that end in “um” for plural replace it with “a”. Example: bacterium (singular), bacteria (plural)

Rule Six:

Terms that end in “us” for plural replace it with “i”. Example: bronchus (singular), bronchi (plural)

Rule Seven:

Terms that end in “itis” for plural replace it with “itides”. Example: arthritis (singular), arthrides (plural)

Rule Eight:

Terms that end in “nx” for plural replace it with “nges”. Example: phalanx (singular), phalanges (plural)

Rule Nine:

Terms that end in “y” for plural replace it with “ies”. Example: therapy (singular), therapies (plural)

Rule Ten:

Terms that end in “x” for plural replace it with “ces”. Example: thorax (singular), thoraces (plural)
[ 1 ] Quick Introduction.

[ 2 ] Word Building Reference (See below): new icon   This is a great reference to help strengthen your understanding of medical terminology.   See how common medical terms are created using the various prefixes, suffixes, and root words.

[ 3 ]  Medical Terms – Singular versus plural rules

[ 4 ]  Medical Terminology Exams  new icon   Twenty new exams were created to test your knowledge of medical terminology.

[ 5 ]  Medical Terms – Prefixes, roots, suffixes (Reference).

 

Increasing your understanding of medical terminology

Word Building Reference– This resource strengthens your understanding of medical terminology. See how common medical terms are created using the various prefixes, suffixes, and root words.

a b c d e f g h i j k l m
n o p q r s t u v w x y z

Medical Terminology Intuitive Section Medical Terms - Singular versus plural rule
This section was developed for ‘speed learning’ of medical terminology.

a b c1 c2 d e f g h i j k l
m n o p q r s t u v w x y

Additional references:

Prefixes denoting numbers
Prefixes denoting position and/or direction
Prefixes denoting measurement
Medical Terminology Noun Suffixes
Combining forms for color
Common Prefixes
Adjective Suffixes
Specialties and specialists med terms
Instruments, surgical, and diagnostic procedures
Negative prefixes
Common suffixes


Quick Introduction– provides an overview and introduction to medical terminology. 
Medical Terms – rules governing singular versus plural versions of medical terms are described.