From an unused root meaning to glare; a flash of lightning -- bright cloud, lightning.
H2385. chaziz
[חֲזִיז] noun [masculine] thunder-bolt, lightning flash (Late Hebrew חֲזִיז; Aramaic חֲזִיזָא shining cloud) — only construct חֲזִיז and plural חֲזִיזִים; קֹלוֺת לַחֲזִיז וְדֶרֶךְ Job 28:26 and a way for thunder-bolts = 38:25; ׳י חֲזִיזִים עשֶֹׁה Zechariah 10:1 ("" גֶּשֶׁם מְטַרֿ).