G3684
ὀνικός
huge millstone
ὀνικός, -ή, -όν (ὄνος), of or for an ass. μύλος ὀ., Mat.18:6, Mrk.9:42 (elsewhere only in π.; see MM, xviii).† (AS)
The KJV translates G3684 in the following manner:
millstone (2x)
Full Thayer's lexicon entry
ὀνικός — onikós
ὀνικός, ὀνικη, ὀνικον (ὄνος), of or for an ass: μύλος ὀνικός i. e. turned by an ass (see μύλος, 1), Mar 9:42 L T Tr WH; Luk 17:2 Rec.; Mat 18:6. Not found elsewhere.
2 occurrences
Matthew (1), Mark (1)