γνώστηςgnṓstēs

one who knows, an expert: Acts 26:3.

Greek (New Testament) · G1109

Same root

γινώσκωginṓskō · G1097to "know" (absolutely) in a great variety of applications and with many implications (as follow, with others not thus clearly expressed)

Where it appears

Appears 1 times in the Bible.

Acts 26:3 for I know you are an expert on all Jewish customs and controversies. Now please listen to me patiently!

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.