John 1:18
From Textus Receptus
John 1:18 No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.
Monogenes
The Codex Vaticanus has μονογενὴς θεός (only begotten God) here in John 1:18 instead of the usual μονογενὴς υἱός (only begotten Son)
Many modern Greek dictionaries falsely define the Greek monogenes as "unique" or "one of a kind".
Only Beggoten God?
The Codex Vaticanus has μονογενὴς θεός (only begotten God) here in John 1:18. P66 and P75 both read θεός. In the Alexandrian tradition, scibes used the abbreviations (Υς/Θς). Υς for son and Θς for God.