nephalist n.

"teetotaler, one who practices or advocates total abstinence from intoxicating drink," 1860, from Late Greek nēphalismos, from nēphalios "sober," from nēphein "be sober," often metaphorical, from IE *(n)egwh-"sober," with negative particle + *hegwh- "drink." Related: Nephalism (1859).