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ἰός

iós /ee-os'/ Ask about this word
perhaps from (to go) or (to send)
rust (as if emitted by metals); also venom (as emitted by serpents)
poison, rust.
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Core Meaning & Semantic Range

The Greek word iós, represented by G2447, carries a dual meaning of rust and poison. It appears 3 times in 3 unique verses in the Bible. The word is defined as "rust (as if emitted by metals); also venom (as emitted by serpents)." This dual definition allows it to be used metaphorically for both material decay and deadly, corrupting influences.

Biblical Occurrences & Contextual Analysis

In its biblical occurrences, G2447 illustrates two distinct forms of corruption. In James, it is used to describe the corrupting power of wealth, where the rust of hoarded gold and silver will act as a witness against the rich and "eat your flesh as it were fire" James 5:3. The word is also used to depict the destructive nature of speech. Paul describes the speech of the unrighteous as having the poison of asps under their lips Romans 3:13, and James calls the untamable tongue an evil full of deadly poison James 3:8.

Related Words & Concepts

Several related words clarify the context of G2447 as both rust and poison:

  • G2728 katióō (to rust down, i.e. corrode): This word, translated as "cankered," appears alongside iós in James 5:3 to describe the decay of wealth.
  • G1100 glōssa (the tongue): This is the source of the verbal poison in both Romans 3:13 and James 3:8, highlighting the connection between speech and spiritual harm.
  • G2287 thanatḗphoros (death-bearing, i.e. fatal): This adjective directly modifies iós in James 3:8, emphasizing the lethal nature of the "deadly poison" that the tongue can dispense.
  • G785 aspís (asp): This term identifies the source of the venom in Romans 3:13, where the poison of asps is a metaphor for deceitful words.

Theological Significance

The theological weight of G2447 is significant, symbolizing different facets of corruption.

  • Corruption of Materialism: In James 5:3, the rust is not merely a sign of decay but an active agent of judgment. It serves as a witness against the unrighteous and metaphorically consumes their flesh G4561, showing how attachment to worldly wealth leads to destruction.
  • The Destructive Power of the Tongue: The use of iós as poison (Romans 3:13, James 3:8) characterizes human speech as potentially lethal. The tongue is described as an unruly G183 evil G2556, filled with a "deadly" substance, which frames sinful communication as a source of spiritual death.
  • An External Sign of Internal Wickedness: The dual meaning connects the visible decay of metals (rust) with the invisible venom of the heart expressed through words (poison). It illustrates the principle that inner corruption will eventually manifest in outward, destructive ways.

Summary

In summary, G2447 is a potent word that signifies both physical corrosion and deadly venom. It serves as a stark biblical metaphor for the consequences of sin, whether through the accumulation of wealth that rusts and testifies against its owner, or through words that act as a fatal poison. The term powerfully links the decay of the material world to the moral and spiritual corruption that originates from within a person.

Grammatical Forms

In the Greek New Testament, this word appears as a noun across 3 occurrences, inflected in 2 grammatical forms.

  • Nominative Singular Masculine
  • Genitive Singular Masculine
Nominative
The subject of the verb.
Genitive
Possession or source — often "of".
Singular
One.
Masculine
Masculine grammatical gender.

Theographic Context

Biblical Distribution

Appears in 3 verses across 2 books. Most frequent in James (2 verses).

1
Romans
2
James

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