From an unused root (meaning to liquify); asphalt (from its tendency to soften in the sun) -- pitch.
H2203. zepheth
זֶ֫פֶת noun feminineIsaiah 34:9 pitch (compare on formative Ol§ 164 c) Sta§ 187 a. Word is Armenian according to LagArm. Stud. 1351, BN 219; on Egyptian derivatives compare CookSpeaker's Comm. i. 484; Arabic according to Frä151, if Shemitic, is Aramaic loan-word; see also Ethiopic Di1068) — pitch: — וּבַזָּ֑פֶת בַחֵמָר וַתַּחְמְרָה Exodus 2:3 of ark of bulrushes; Isaiah 34:9 a לְגָפְרִ֑ית וַעֲפָרָהּ לְזֶפֶת נְחָלֶיהָ וְנֶחֶפְכוּ, 34:9 b בֹּעֵרָֽה׃ לְזֶפֶת אַרְצָהּ והיתה.