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Greek adjective · G4603

σιδήρεος

sidereossid-ay'-reh-os

iron

5 uses in the Greek text, one for each word STEP Bible has tagged with this key

Concordance spelling: sidḗreos

Word page · Part of the concordance, one page for every word of the Hebrew and Greek text. Strong's G4603is this word's number in James Strong's 1890 index of the King James Bible.

  • 2 of 27
    New Testament books
  • 3
    spellings

The definition in full

Strong's key (1890) · G4603

made of iron

The King James renders it: (of) iron.

James Strong, The Exhaustive Concordance of the Bible (1890), public domain. Strong indexed the King James text, and this site quotes his entry as that index.

Summary

sidereos is rendered "iron". It stands 5 times in the Greek text, across two books.

  • Four of the uses stand in Revelation, more than in any other book.
  • Its first use in canonical order opens the ledger below.Acts 12:10They passed the first and second guards and came to the iron gate leading to the city, which opened for them by itself. When they had gone outside and walked the length of one block, the angel suddenly left him.
  • The Greek text spells it three different ways.

The first use

They passed the first and second guards and came to the iron gate leading to the city, which opened for them by itself. When they had gone outside and walked the length of one block, the angel suddenly left him.

Acts 12:10σιδηρᾶν

The first use, in the order of the New Testament's books.

Where the word stands

Four of the word's five uses are in Revelation.

The other 25 New Testament books never use the word.

What the word means

Each meaning, and the words it is translated by

How the Greek text is glossed, word by word

  • of iron4
  • iron1

The words built on the same word-part

Each word below begins with the same letters this one begins with. A shared word-part shows a family. It does not settle what any one of them means, so each word carries its own uses on its own page. Scholars call that shared part the stem.

σίδηροςsiderosironUses1

All 5, in canonical order

Every use, in order

Every use, grouped by book, with its verse.

3 spellings and their grammar

STEP Bible tags every word of the Hebrew and Greek text with its spelling and its grammar. Both lists below count the rows printed underneath, written out in English, with the code beside each one as it was tagged.

How it is spelled

  • σιδηρᾷ3
  • σιδηρᾶν1
  • σιδηροῦς1

The grammar of each form

  • adjective · dative (“to / for”) · feminine singular3A-DSF
  • adjective · accusative (object) · masculine plural1A-APM
  • adjective · accusative (object) · feminine singular1A-ASF

Acts

one use
  • They passed the first and second guards and came to the iron gate leading to the city, which opened for them by itself. When they had gone outside and walked the length of one block, the angel suddenly left him.

    Acts 12:10

    • σιδηρᾶνsideranadjective · accusative (object) · feminine singulartagged: iron

Revelation

four uses
  • He will rule them with an iron scepter and shatter them like pottery—just as I have received authority from My Father.

    Revelation 2:27

    • σιδηρᾷsideraadjective · dative (“to / for”) · feminine singulartagged: of iron
  • They also had thoraxes like breastplates of iron, and the sound of their wings was like the roar of many horses and chariots rushing into battle.

    Revelation 9:9

    • σιδηροῦςsiderousadjective · accusative (object) · masculine pluraltagged: of iron
  • And she gave birth to a son, a male child, who will rule all the nations with an iron scepter. And her child was caught up to God and to His throne.

    Revelation 12:5

    • σιδηρᾷsideraadjective · dative (“to / for”) · feminine singulartagged: of iron
  • And from His mouth proceeds a sharp sword with which to strike down the nations, and He will rule them with an iron scepter. He treads the winepress of the fury of the wrath of God the Almighty.

    Revelation 19:15

    • σιδηρᾷsideraadjective · dative (“to / for”) · feminine singulartagged: of iron

Where it leads

How the numbers are counted

Every count on this page comes from STEP Bible's tagged Hebrew and Greek text, the same text the ledger prints. A use is counted once each time the tagging marks a word with this key.

Spellings are counted as the Greek text spells them, with the sentence's own punctuation taken off the word first, so a form that ends a clause is not counted as a second spelling.

The family is read from the lexicon by the stem the two words share, with the accents off, and a person or a place named on the stem is left out.

Hebrew and Greek text, word tagging and grammar: STEP Bible (www.STEPBible.org), Tyndale House, CC BY 4.0. Their grammar codes are written out in English here and shown as tagged beside each one.

Meaning and senses: STEP Bible TBESG (Tyndale House, CC BY 4.0), the Brief lexicon based on Abbott-Smith (1922).

Dictionary key: Strong's Exhaustive Concordance of the Bible (1890, public domain). English verse text: Berean Standard Bible (public domain, 2023).

Revised 2026-09-05. Every cited work, the sources registry →