He worked three decades as a professional research linguist. Oryol's work encompassed extraordinary variety of interests: from
Slavic via modern
Balkan languages to
Paleo-Balkan languages (most notably
Phrygian), from
Proto-Indo-European roots and its
Nostratic context on the one hand, to the analysis of
Biblical Hebrew and
Old Testament texts and
Proto-Afroasiatic language on the other hand. He has left behind about 200 articles and over two dozen reviews. Above all, however, are 6
monographs, four of which are etymological dictionaries (with the unassuming titles such as
Handbook of Germanic Etymology actually hiding a full etymological dictionary). Finally, the third part of his
Russian etymological dictionary (which was already termed as "new
Vasmer") was unfinished due to his death. His
Albanian Etymological Dictionary (1998) is a useful overview of existing etymologies, and it well complements his
A Concise Historical Grammar of Albanian (2000). The monograph
Phrygian Language (1997) summarizes the old/neo-Phrygian epigraphy, interpretation of all the known inscriptions until the 1990s and the corresponding grammatical comments. Oryol also dealt with the
Indo-European languages, especially the
Balto-Slavic,
Germanic,
Albanian, and
Celtic branches. He also took interest in
Semitic languages,
Hebrew in the first place, and more broadly in
Afroasiatic languages as a whole, where lie his most controversial results. Through collaboration with he published the
Hamito-Semitic Etymological Dictionary (1995) which on one hand brought a number of new sub-lexical comparisons, especially Semitic-Chadic. On the other hand, the value of the benefits of reduced transcriptions used and inaccurate translations, absence of primary sources for non-written languages, and especially countless pseudo-reconstructions formulated
ad hoc often on two or even a single word were seriously frowned upon by specialists, who also pointed out other serious errors in the work (especially in Cushitic material, as well as not neglecting the massive number of Arabic loanwords in Berber languages). He published the following monographs: • together with Olga Stolbova,
Hamito-Semitic Etymological Dictionary. Leiden: Brill, 1995 (578 pp.) •
The Language of Phrygians. Ann Arbor: Caravan Books, 1997 (501 pp.) •
Albanian Etymological Dictionary. Leiden: Brill, 1998 (670 pp.) •
A Concise Historical Grammar of Albanian. Leiden: Brill, 2000 (350 pp.) •
Handbook of Germanic Etymology. Leiden: Brill, 2003 (700 pp.) •
Russian Etymological Dictionary. Vol. 1:
A–J. Ed.
Vitaly Shevoroshkin. Calgary: Octavia, 2007 (408 pp.) •
Russian Etymological Dictionary. Vol. 2:
K–O. Ed. Vitaly Shevoroshkin. Calgary: Octavia, 2007 (395 pp.) •
Russian Etymological Dictionary. Vol. 3:
P–S. Ed. Vitaly Shevoroshkin. Calgary: Octavia, 2008 (327 pp.) •
Russian Etymological Dictionary. Vol. 4:
T–Ja. Ed. Cindy Drover-Davidson. Calgary: Theophania Publishing, 2011 (298 pp.) ==References==