A primitive root; properly, to carve or engrave, i.e. (by implication) to inscribe indelibly -- mark.
H3799. katham
[כָּתַם] verb only
Niph`al be stained (Late Hebrew Niph`al id. (Jastr); כֶּתֶם blood-stain; כְּתִים ᵑ7 (blood-)stained Isaiah 1:18; כִּיתְמָא blood-stain Jeremiah 2:22; Syriac stain, defile, Participle, also Pa`el, Ethpa`al, and derive.; Arabic is cover, conceal, so Assyrian katâmu; Zinjirli כתם (?) DHMSendsch. P. 37); —
Niph`al Participle, figurative, לְפָנַי עֲוֺנֵךְ נִכְתָּם Jeremiah 2:22 stained is thine iniquity before me (compare English phrase iniquity of deepest dye).
II. כתם (√ of following; meaning unknown).