Generally, only a subset of the verb derivations formed from triliteral roots are allowed with quadriliteral roots. For example, in Hebrew the Pi``el, Pu``al, and Hitpa``el, and in Arabic forms similar to the stem II and stem V forms of triliteral roots.
Traditionally in the Semitic languages, forms with more than four basic consonants (i.e. consonants not introduced by morphological inflection or derivation) were occasionally found in nouns — mainly loanwords from other languages — but never in verbs. However, in modern Israeli Hebrew, syllables are allowed to begin with a sequence of two consonants (a relaxation of the situation in early Semitic, where only one consonant was allowed), and this has opened the door to apparent five root-consonant forms, such as טלגרף tilgref "he telegraphed". But, -lgr- always appears as an indivisible cluster in the derivation of this verb, so that these five root-consonant forms do not display any fundamentally different morphological patterns from four root-consonant forms (and the hypothetical term "quinqueliteral" would be misleading if it implied otherwise).
Talebearers, peddlers, spies, and converts: the adventures of the biblical and Post-biblical roots [TEXT NOT REPRODUCIBLE IN ASCII.] and [TEXT NOT REPRODUCIBLE IN ASCII.].(Critical essay)
Jan 01, 2005; The first part of the article scrutinizes the exact meaning of the biblical and postbiblical words derived from the roots [TEXT...