Slav

[slahv, slav] /slɑv, slæv/
noun
1.
one of a group of peoples in eastern, southeastern, and central Europe, including the Russians and Ruthenians (Eastern Slavs) the Bulgars, Serbs, Croats, Slavonians, Slovenes, etc. (Southern Slavs) and the Poles, Czechs, Moravians, Slovaks, etc. (Western Slavs)
adjective
2.
of, pertaining to, or characteristic of the Slavs; Slavic.
Origin
1350-1400; < Medieval Latin Slāvus, variant of Sclāvus, akin to Late Greek Sklábos < a Slavic ethnonym, perhaps originally a name for all Slavic tribes (cf. Slovak, Slovene, Old Russian Slověně an East Slavic tribe); replacing Middle English Sclave < Medieval Latin Sclāvus

Slav

1.
Slavic.
Also, Slav.
British Dictionary definitions for Slav

Slav

/slɑːv/
noun
1.
a member of any of the peoples of E Europe or NW Asia who speak a Slavonic language
Word Origin
C14: from Medieval Latin Sclāvus a captive Slav; see slave
Word Origin and History for Slav
n.

late 14c., Sclave, from Medieval Latin Sclavus (c.800), from Byzantine Greek Sklabos (c.580), from Old Church Slavonic Sloveninu "a Slav," probably related to slovo "word, speech," which suggests the name originally identified a member of a speech community (cf. Old Church Slavonic Nemici "Germans," related to nemu "dumb;" and cf. Old English þeode, which meant both "race" and "language").

Identical with the -slav in personal names (e.g. Russian Miroslav, literally "peaceful fame;" Mstislav "vengeful fame;" Jaroslav "famed for fury;" Czech Bohuslav "God's glory;" and cf. Wenceslas). Spelled Slave c.1788-1866, influenced by French and German Slave. As an adjective from 1876.