Word structure and stem elements
To correctly understand the structure of a term, it is necessary to distinguish the stem from other morphemes. All elements of a word are divided into roots, endings, and derivational affixes. Derivational affixes refer to prefixes and suffixes — the parts of the word used to create new concepts.
The composition of the stem can vary:
- It may be represented exclusively by the root (for example, in the word vertebra, dropping the ending -a leaves the stem vertebr-).
- May include a root and affixes. In the adjective vertebralis (vertebral), the stem vertebral- includes the suffix -al-, while in the term intervertebralis (intervertebral), the stem intervertebral- contains both a prefix and a suffix.
Types of word structure analysis
There are two approaches to parsing the structure of a term. The difference between them is clearly demonstrated by the adjective interlobularis (interlobular).
- Morphemic analysis breaks the word down into all minimal meaningful parts. In our example, five morphemes are distinguished: the prefix inter-, the root -lob-, suffixes -ul- and -ar-, and the ending -is.
- Derivational analysis shows the actual mechanism of term creation. This approach distinguishes only two parts: the prefix inter- ("between") and the base stem lobular(is) ("lobular"). The main conclusion: the word is formed by adding a prefix to an already existing adjective, rather than assembling five elements "from scratch".
Base and derived stems
Base (producing) stem is the foundation to which one or more affixes are attached to form a new word. The resulting structurally more complex stem is called derived.
To correctly identify the base stem, the analyzed word is compared with two series of words:
- A series of words with the same root. For example, for the term cholecystitis, these would be cholecystopexia, cholecystographia.
- A series of words with the same affix. For cholecystitis, these are gastritis, nephritis, vaginitis.
Motivating stems and semantic complexity
The base stem performs two functions: it forms the material "skeleton" of the word and motivates (determines) the meaning of the derived term. In terminological science, "motivating stem" equals "base stem", and "motivated" equals "derived".
A motivated word is always characterized by greater semantic complexity (a more complex meaning). Let us examine a histological chain using the term myoblastus (myoblast — a poorly differentiated cell) as an example. It consists of the roots myo- (muscle) and blastus (germ/bud). At the next stage, the word myoblastus itself becomes the motivating base for the tumor name — myoblastoma.
Word combinations as motivating stems
Sometimes the motivating concept is an entire anatomical word combination (noun + adjective), but the base stem for the new term is only the adjective.
- Ductus choledochus (common bile duct): the stem choledoch- is taken, from which surgical terms such as choledochoplastica and choledochoscopia are built.
- Processus mastoideus (mastoid process): the base stem mastoid- gives rise to clinical terms mastoiditis, mastoidotomia.
- Ductus hepaticus (hepatic duct): the stem hepatico- is used to denote operations specifically on the hepatic duct (for example, hepaticotomia).
To flawlessly identify the base stem, apply the "two-series rule": compare the analyzed term with a series of words having the same root (meaning check) and with a series of words having the same affix (formation mechanism check).
Class and exam questions
What is the difference between a motivating and a motivated word?
The motivating word serves as the base and establishes the primary meaning. The motivated word is formed from it, differs by being longer (by at least one morpheme), and has a more complex semantic meaning.
What are derivational affixes?
These are prefixes and suffixes. They are parts of the word that serve specifically for forming new words with new meanings.
How to prove that a term is formed by adding a prefix?
It is necessary to perform a derivational analysis. For example, the term intervertebralis is divided into two parts: the prefix inter- and the pre-existing word vertebralis. This proves the mechanism of its formation.
What else to study on this topic
- Morphemic composition and functions of suffixes in clinical terminology
- Derivational analysis of complex clinical terms
- Histological chains and semantic complexity of terms
- Greek and Latin doublet roots in word stems
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Other Topics in the Section "Morpheme, TE, Suffixation in Word-Formation"
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