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Proto-Indo-European root
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The roots of the reconstructed Proto-Indo-European language (PIE) are basic morphemes carrying a lexical meaning. By addition of suffixes, they form stems, and by addition of endings, these form grammatically inflected words (nouns or verbs).
Except for a very few cases, the PIE root is fully characterized by its constituent consonants, while the vowel may alternate, a process called ablaut. The roots as a rule have a single syllabic core, and by ablaut may either be monosyllabic or unsyllabic.
centre of a PIE root is the ablauting vowel (usually , perhaps sometimes in the full grade).
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The roots of the reconstructed Proto-Indo-European language (PIE) are basic morphemes carrying a lexical meaning. By addition of suffixes, they form stems, and by addition of endings, these form grammatically inflected words (nouns or verbs).
Except for a very few cases, the PIE root is fully characterized by its constituent consonants, while the vowel may alternate, a process called ablaut. The roots as a rule have a single syllabic core, and by ablaut may either be monosyllabic or unsyllabic.
Phonotactics
Basic root structure
The centre of a PIE root is the ablauting vowel (usually , perhaps sometimes in the full grade). This vowel constitutes a sonority peak that is preceded and followed by a sequence of consonants with progressively decreasing sonority values (i.e., the sonority has to fall toward both edges of the root). The sonority hierarchy is as follows:
- Plosives (see Proto-Indo-European phonology for a table of PIE plosives)
This gives the following root structure (with P being a plosive and an empty position):
Note that after a vowel is often written , and after a vowel is often written . Thus, "to bind" and "to run" are allowed roots.
Other possible roots include "foot", "door" and "to moisten". Forbidden are structures like (wrong order of phonemes) and (two phonemes of the same group).
Additional phonemes
The remaining sounds, namely the laryngeals and the sibilant , can occupy almost any place in the hierarchy. is particularly common in initial position (see s-mobile).
Examples of such roots are "to fly", "to nourish" and "to stroke".
Restrictions on the plosives
A root cannot contain two plain voiced plosives , nor can it contain a voiced aspirate and a voiceless plosive , unless the latter occurs in a word-initial cluster together with an s-mobile (e.g. "to stiffen").
Restrictions on the number of phonemes
The vowel has to be preceded and followed by at least one consonant each. The maximum number of consonants seems to be five (as in "tight").
Early PIE scholars reconstructed a number of roots beginning or ending with a vowel. The latter type always had a long vowel ( "to put", "to grow", "to give"), while this restriction did not hold for vowel-initial roots ( "to eat", "front", "smell"). Laryngeal theory can explain this behaviour by reconstructing a laryngeal following the vowel ( , resulting in a long vowel) or preceding it ( , resulting in a short vowel). These reconstructions obey the mentioned rules.
Exceptions
It should be noted that some roots like "to sneeze" do not seem to follow these rules. This might be due to incomplete understanding of PIE phonotactics or to wrong reconstructions.
Meaning of roots
Each PIE root has an inherent meaning which is not always directly reconstructable, due to semantic shifts as well as discrepancy in the meanings of reflexes in the attested daughter languages.
Reconstructed roots usually have verbal meaning, and nouns are derived by suffixation or other means (see the morphology of the Proto-Indo-European noun for some examples). This even holds for roots translated as nouns in the previous sections: , for example, can also mean "to tread", depending on the ablaut grade and ending.
Some nouns like "lamb" or "daughter-in-law", however, are not derived from established roots.
Root extensions
Root extensions are additions of one or two sounds, often plosives, to the end of a root which do not seem to change its meaning. For "to push, hit, thrust", we can reconstruct
The source of these extensions is not known.
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