shoreshim
Shoreshim, plural of shoresh, are the consonantal roots at the core of Hebrew words. In Hebrew and other Semitic languages, most words are formed from roots consisting of three consonants (a triliteral root), though some roots have four consonants (a quadriliteral root). The root carries the basic semantic content, while vowels, prefixes, suffixes, and patterns modify its meaning and grammatical category.
Word formation uses patterns and verbal stems known as binyanim. From a single shoresh, related words are
Weak roots—where one or more letters are aleph, hey, vav, or yod—can alter or disappear in certain