From chalal in the sense of opening; a commencement; rel. Original (adverb, -ly) -- begin(-ning), first (time).
see HEBREW chalal
H8463. tachalu
תַּחֲלֻאִים noun plural masculine2 Chronicles 21:19 diseases, absolute ׳ת Jeremiah 16:4; 2 Chronicles 21:19; construct תַּחֲלוּאֵי Jeremiah 14:18; תַּחֲלוּאָ֫יְכִי Psalm 103:3; תַּחֲלֻאַ֫יהָ Deuteronomy 29:21; — diseases 29:21; 2 Chronicles 21:19; Psalm 103:3; יָמֻתוּ תחלאים מְמוֺתֵי Jeremiah 16:4; רעב תחלואי 14:18 diseases of famine ("" חַלְלֵיחֶחֶרֶב).
II. חלא (√of following; DHM in MV compare Sabean ותחלאן פחֿטאת she sinned and defiled herself).