the branch of linguistics that investigates the origins of words, their original structures, and their semantic relationships.
The term “etymology” was introduced more than 2,000 years ago by the classical philosophers. In the broad sense, etymology is the reconstruction of the phonetic and derivational elements of a word. In addition to demonstrating relationships between sounds and identifying identical morphemes, it accounts for the selection of morpheme combinations in specific derivational patterns. The term “etymology” is also applied to an account of the derivation of a word.
Characterized by a multiplicity of possible solutions, etymological study makes extensive use of hypothesis and seldom arrives at definitive results. Etymology is a special case of the explanatory sciences, whose constructs, unlike those of the descriptive sciences, are markedly hypothetical in nature.
The basis for etymological research is provided by comparative-historical linguistics. Consequently, etymology has proved most successful in dealing with the languages that have undergone the most extensive comparative-historical study—for example, the Indo-European and Finno-Ugric languages. Cases of secondary etymological interpretation or the linking of words that do not come from the same source are called folk, or false, etymologies.
O. N. TRUBACHEV