3684. onikos
Lexical Summary
onikos: Of a donkey, pertaining to a donkey

Original Word: ὀνικός
Part of Speech: Adjective
Transliteration: onikos
Pronunciation: o-nee-kos
Phonetic Spelling: (on-ik-os')
KJV: millstone
NASB: heavy
Word Origin: [from G3688 (ὄνος - donkey)]

1. belonging to a donkey, i.e. large (so as to be turned by a donkey)

Strong's Exhaustive Concordance
of or for a donkey

From onos; belonging to a ass, i.e. Large (so as to be turned by a ass) -- millstone.

see GREEK onos

NAS Exhaustive Concordance
Word Origin
from onos
Definition
of or for a donkey
NASB Translation
heavy (2).

Thayer's Greek Lexicon
STRONGS NT 3684: ὀνικός

ὀνικός, ὀνικη, ὀνικον (ὄνος), of or for an ass: μύλος ὀνικός i. e. turned by an ass (see μύλος, 1), Mark 9:42 L T Tr WH; Luke 17:2 Rec.; Matthew 18:6. Not found elsewhere.

Topical Lexicon
Definition and Literal Background

Strong’s 3684 describes the type of great millstone that was so large it had to be turned by a donkey. In village life the smaller hand-mill was commonly operated by women (Matthew 24:41), but the ὀνικὸς “donkey-driven” stone stood for an industrial-sized weight that only animal power could move. Because it could weigh hundreds of pounds, it became a ready image for an inescapable, catastrophic judgment.

Occurrences in the New Testament

Matthew 18:6 and Mark 9:42 preserve Jesus’ identical warning.

Matthew 18:6: “But if anyone causes one of these little ones who believe in Me to stumble, it would be better for him to have a large millstone hung around his neck and to be drowned in the depths of the sea.”

Mark 9:42: “Whoever causes one of these little ones who believe in Me to stumble, it would be better for him if a large millstone were hung around his neck and he were thrown into the sea.”

Historical and Cultural Insights

1. Capital punishment by drowning was used by some Gentile powers, but it was abhorrent to first-century Jews. Jesus chose an image that His hearers would recognize as both terrifying and foreign, heightening the moral seriousness of leading the vulnerable astray.
2. A millstone that required a donkey would normally stay fixed in a courtyard. To picture such a stone tied to a neck and carried out to sea underscores absolute hopelessness; no swimmer could surface under such weight.
3. The Sea (Galilee or Mediterranean) often symbolized chaos and death. Combining the sea with the ὀνικὸς millstone layers two “inescapable” motifs.

Thematic Significance in Scripture

• Protection of the weak: The “little ones” are believing children or young disciples. Christ’s standard of care is so high that any harm is met with the severest analogy.
• Judgment proportional to offense: The bigger the stone, the more final the fate. Spiritual sabotage of the defenseless invites a punishment more dreadful than physical death (cf. Hebrews 10:29).
• Integrity in leadership: The saying applies to parents, teachers, pastors, and any believer who exercises influence. Authority is stewardship, and negligence is treason against the King’s own.
• The cost of scandal: The Greek σκανδαλίζω (“to cause to stumble”) is the moral tripwire. Jesus presses home that covert or subtle stumbling blocks are no less damnable than overt persecution.

Wider Biblical Echoes

Revelation 18:21 pictures a “millstone” hurled into the sea to dramatize Babylon’s final ruin, echoing the same motif of irreversible judgment. Though the word group differs, the imagery parallels the ὀνικὸς warning: when sin reaches its full measure, downfall is sudden and unrecoverable.

Applications for Discipleship and Ministry

• Child discipleship: Prioritize environments that nurture faith and guard innocence, knowing that negligence invites divine censure.
• Teaching and counseling: Gauge every word, curriculum, and example by whether it builds up or trips up the “little ones.”
• Church discipline: Tolerating predators—spiritual or moral—is antithetical to Christ’s command; swift protective action is a Gospel imperative.
• Personal holiness: Private compromise often becomes public stumbling. The millstone image calls believers to radical self-watchfulness (Mark 9:43-48 continues with self-surgery metaphors).
• Evangelism: Jesus’ severe tone magnifies the worth He assigns to each believer. Shepherding the new and fragile in faith is not optional but central to the Great Commission.

The donkey-driven millstone thus stands as a vivid, weighty symbol: God’s kingdom cherishes its smallest members, and heaven’s King will personally avenge any who make them fall.

Forms and Transliterations
ονικος ονικός ὀνικὸς onikos onikòs
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Englishman's Concordance
Matthew 18:6 Adj-NMS
GRK: κρεμασθῇ μύλος ὀνικὸς περὶ τὸν
NAS: it would be better for him to have a heavy millstone
INT: should be hung a millstone heavy upon the

Mark 9:42 Adj-NMS
GRK: περίκειται μύλος ὀνικὸς περὶ τὸν
NAS: for him if, with a heavy millstone
INT: is put a millstone heavy about the

Strong's Greek 3684
2 Occurrences


ὀνικὸς — 2 Occ.

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