By contraction from talal; a mound -- heap, X strength.
see HEBREW talal
H8510. tel
תֵּל noun [masculine] mound; —
1 mound, ruin-heep (of city): construct תֵּל(ֿ)עוֺלָם Joshua 8:28 (JE), Deuteronomy 13:17, שְׁמָמָה תֵּל Jeremiah 49:2.
2 mound or hill on which city stood: suffix תִּלָּם Joshua 11:18 (D), תִּלָּתּ Jeremiah 30:18.