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Most English Bibles can't carry the full weight of what's in the original Hebrew and Greek. The F.O.G. Bible Project exists to change that: three new translations built publicly (a Study Bible, a Reader's Paraphrase, and F.O.G. Family), plus a word-by-word renewal of Strong's Concordance. It is Jean Paul Joseph's lifelong work, unfolding in public — and you're invited in.

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G4603 (σιδήρεος)

Summary

Quick facts

Strong’s Number: G4603
Original Word: σιδήρεος
Transliteration: sidḗreos
Pronunciation: sid-ay'-reh-os
Part of Speech: adjective
Category: Creation
Root / Etymology: from G4604 (σίδηρος);
Frequency: 5×
Gematria: 597

Where it appears

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Definition

Strong 1890 made of iron

(of) iron

from G4604 (σίδηρος);

Commentary

Contributors:

Strong's G4603: An adjective meaning "made of iron," derived from σίδηρος (iron). In biblical usage, it appears in contexts emphasizing strength, authority, or oppression. The word carries connotations of both power and inflexibility, often used metaphorically in prophetic and apocalyptic literature.

U- Unveiling the Word

σιδηροῦς represents both literal iron construction and metaphorical strength or inflexibility. First appearing in Acts 12:10 describing the prison gate that miraculously opened for Peter, it symbolizes seemingly insurmountable barriers that God can overcome. Early church writers saw in this word both the reality of persecution (iron chains) and the power of God to deliver. Today, it reminds us that no barrier, however strong, can withstand God's purpose.

N - Necessary Information

Greek Word: σιδηροῦς, sidērous, see-day-ROOS
Detailed pronunciation: stress on last syllable: 'see' as in see, 'day' as in day, 'ROOS' as in roost
Part of Speech: Adjective

Etymology:

From σίδηρος (sidēros) - iron
-οῦς (-ous): Adjectival ending indicating material composition

D - Defining Meanings

Made of iron
Iron-like
Strong as iron

For compound words:
Not applicable as σιδηροῦς is derived with an adjectival suffix

Translation Options:

"Iron" - When used attributively
"Made of iron" - More explicit
"Iron-like" - When used metaphorically

E - Exploring Similar Words

χαλκοῦς (chalkous, khal-KOOS) - made of brass See G5470
χρυσοῦς (chrusous, khroo-SOOS) - made of gold See G5552
ἀργυροῦς (argurous, ar-goo-ROOS) - made of silver See G693

R - Reviewing the Word's Morphology

Adjective Features:

Case: Nominative, Genitive, Dative, Accusative
Number: Singular, Plural
Gender: Masculine, Feminine, Neuter
Declension: Contract adjective (2nd/1st)

Examples:
Masculine: σιδηροῦς (nom), σιδηροῦ (gen)
Feminine: σιδηρᾶ (nom), σιδηρᾶς (gen)
Neuter: σιδηροῦν (nom/acc), σιδηροῦ (gen)

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S - Studying Lexicon Insights

BDAG emphasizes both literal and metaphorical uses. Thayer's notes its connection to strength and authority. LSJ documents its use in technical contexts. Vine's highlights its symbolic significance. Strong's connects it to unbending strength. Moulton-Milligan provides evidence from commercial documents.

T - Tracing the Scriptures

First appearance:
"When they were past the first and the second ward, they came unto the iron gate that leadeth unto the city; which opened to them of his own accord:" Acts 12:10

Additional References:
Revelation 2:27, Revelation 9:9, Revelation 12:5, Revelation 19:15

A - Analyzing Classical Usage

Author: Work	Text
Herodotus: Histories	"They forged iron weapons for battle."
Thucydides: History	"The walls were reinforced with iron gates."
Xenophon: Cyropaedia	"The soldiers wore iron breastplates."

N - Noteworthy Summary

σιδηροῦς reminds us that even the strongest earthly barriers cannot resist God's will. Whether literal iron gates or metaphorical obstacles, all yield to divine power. The word points to Christ's ultimate authority, who rules with an iron scepter yet uses His power for redemption.

D - Did You Know?

Iron was the strongest metal known in biblical times.
The term often symbolized Roman power in early Christian literature.
The "iron scepter" imagery in Revelation draws from Psalm 2.

Part of speech: Adjective

Tags: iron, strength, power, divine authority, barriers, persecution, deliverance, Revelation, apocalyptic imagery, Roman power, divine sovereignty, material qualities

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