A — 1: βρῶσις
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(Strong's #1035 — Noun Feminine — brosis — bro'-sis )

"an eating" (akin to bibrosko, "to eat"), is used metaphorically to denote "rust" in Matthew 6:19,20 . See EAT , B, No. 1, FOOD, MEAT, MORSEL.

A — 2: ἰός
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(Strong's #2447 — Noun Masculine — ios — ee-os' )

"poison," denotes "rust" in James 5:3 . See POISON.

B — 1: κατιόω
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(Strong's #2728 — Verb — katioo — kat-ee-o'-o )

an intensive form of ioo, "to poison" (akin to A, No. 2), strengthened by kata, "down," "to rust over," and in the Passive Voice, "to become rusted over," occurs in James 5:3 , RV, "are rusted" (AV, "are cankered"). Cp. gangraina, "a gangrene," 2—Timothy 2:17 , RV.