1.1: Word Parts and Rules
Learning Objectives
- Identify word parts in medical terms.
- Examine the rules for building medical terms.
Word Parts
Medical terms are built from word parts. Those word parts are prefix , word root , suffix , and combining form vowel . When a word root is combined with a combining form vowel the word part is referred to as a combining form .
Identifying Word Parts in Medical Terms
By the end of this book, you will have identified hundreds of word parts within medical terms. Let’s start with some common medical terms that many non-medically trained people may be familiar with.
Examples
Osteoarthritis
Oste/o/arthr/itis – Inflammation of bone and joint.
Oste/o is a
combining form
that means bone
arthr/o is a
combining form
that means joint
-itis is a
suffix
that means inflammation
Intravenous
Intra/ven/ous – Pertaining to within a vein.
Intra- is a
prefix
that means within
ven/o – is a
combining form
that means vein
-ous is a
suffix
that means pertaining to
Notice, when breaking down words that you place slashes between word parts and a slash on each side of a combining form vowel .
Language Review
Before we begin analyzing the rules let’s complete a short language review that will assist with pronunciation and spelling.
Short Vowels
a, e, i, o, u, and sometimes y are indicated by lower case.
Long Vowels
A, E, I, O, U are indicated by upper case.
Consonants
Consonants are all of the other letters in the alphabet. b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, and z.
Language Rules
Language rules are a good place to start when building a medical terminology foundation. Many medical terms are built from word parts and can be translated literally . At first, literal translations sound awkward. Once you build a medical vocabulary and become proficient at using it, the awkwardness will slip away. For example, suffixes will no longer be stated and will be assumed. The definition of intravenous then becomes within the vein .
Since you are at the beginning of building your medical terminology foundation, stay literal when applicable. It should be noted that as with all language rules there are always exceptions and we refer to those as rebels .
Language Rules for Building Medical Terms
- When combining two combining forms , you keep the combining form vowel .
-
When combining a
combining form
with a
suffix
that begins with a consonant, you keep the
combining form vowel
.
Examples
Gastr/o/enter/o/logy – The study of the stomach and the intestines
- Following rule 1, when we join combining form gastr/o (meaning stomach) with the combining form enter/o (meaning intestines) we keep the combining form vowel o.
- Following rule 2 , when we join the combining form enter/o (meaning intestines) with the suffix -logy (that starts with a suffix and means the study of) we keep the combining form vowel o.
- When combining a combining form with a suffix that begins with a vowel, you drop the combining form vowel .
-
A
prefix
goes at the beginning of the word and no
combining form vowel
is used.
Examples
Intra/ven/ous – Pertaining to within the vein
- Following rule 3 , notice that when combining the combining form ven/o (meaning vein) with the suffix -ous ( that starts with a vowel and means pertaining to) we drop the combining form vowel o.
- Following rule 4 , the prefix intra- (meaning within) is at the beginning of the medical term with no combining form vowel used.
-
When defining a medical word, start with the
suffix
first and then work left to right stating the word parts. You may need to add
filler
words. As long as the filler word does not change the meaning of the word you may use it for the purpose of building a medical vocabulary. Once you start to apply the word in the context of a sentence it will be easier to decide which filler word(s) to choose.
Examples
Intra/ven/ous – Pertaining to within the vein or Pertaining to within a vein.
- Following rule 5 , notice that I start with the suffix -ous (that means pertaining to) then we work left to right starting with the prefix Intra- (meaning within) and the combining form ven/o (meaning vein).
- Notice that we have used two different definitions that mean the same thing.
- In these examples we do not have the context of a full sentence. For the purpose of building a medical terminology foundation either definition is accepted.