BDB5463
נֶ֫תֶר noun [masculine] natron, or carbonate of soda, a mineral alkali (Late Hebrew = Biblical Hebrew; Aramaic נִתְרָא, [untranscribed source text 3498]; compare Greek νίτρον, λίτρον, Latin nitrum (see Lexicons)); — אִםתְּֿכַבְּסִי בַּנֶּתֶר Jer 2:22 though thou wash thyself with natron (figurative; || בֹּרִית; on use of 'nitrum' for handwashing among Greeks see MeinekeFragm. Comicorum ii. 638); חֹמֶץ עַלנָֿ֑תֶר Prov 25:20 (figurative of the incompatible).