Lexical Definition

‎יִדְּעֹנִי‎ yiddᵉʻônîy (yid-deh-o-nee') spiritist H:N-M
from ‎יָדַע‎

wizard.

1) a knower, one who has a familiar spirit
1a) a familiar spirit, soothsayer, necromancer (meton)

See Greek: γνώστης

Usage: 9 forms in 11 verses
Form Translated As     In Verse(s)
יִדְּעֹנִ֖י a soothsayer Lev.20.27
וְיִדְּעוֹנִ֑י and soothsayer 2Chr.33.6
וְיִדְּעֹנִ֔י and a familiar spirit Deut.18.11
וְיִדְּעֹנִ֑ים and soothsayers 2Kgs.21.6
הַיִּדְּעֹנִֽים the soothsayers Isa.19.3
הַיִּדְּעֹנִ֖ים the soothsayers 1Sam.28.3
הַיִּדְּעֹנִ֖י the soothsayer 1Sam.28.9
הַיִּדְּעֹנִ֔ים the soothsayers Lev.19.31Lev.20.6Isa.8.19
הַ֠יִּדְּעֹנִים the soothsayers 2Kgs.23.24

Brown-Driver-Briggs

‎יִדְּעֹנִי‎ noun masculine familiar spirit (properly either as knowing, wise (acquainted with secrets of unseen world), Ew vielwisserisch; or as intimate acquaintance of soothsayer, see RSJPh xiv. 1885. 127) — absolute ‎יִדְּעֹנִי‎ Deut 18:11 + 2 t.; plural ‎יִדְּעֹנִים‎ 1Sam 28:3 + 6 t.; ‎הַיִּדְּעֹנִי מִן‎ 1Sam 28:9, read ‎הַיִּדְּעֹנִים מִן‎ (see ᵐ5 Th We Klo Dr); familiar spirit, always || ‎אוֺב‎, ‎אֹבוֺת‎ 1Sam 28:3; 1Sam 28:9; Isa 8:19; Isa 19:3; 2Kgs 21:6 (‎עשׂה אוֺב‎; || ‎נִחֵשׁ‎, ‎עוֺנֵן‎) = 2Chr 33:6; 2Kgs 23:24; Lev 19:31; Lev 20:6; Lev 20:27 (all H; on last two compare Acts 16:16 and DrDeut 18:11), Deut 18:11(|| ‎אוֺב‎ + ‎דֹּרֵשׁ אֶלהַֿמֵּתִים‎).

Brown-Driver-Briggs References

Book Refs
Leviticus 19:31 · 20:6 · 20:27
Deuteronomy 18:11
1 Samuel 28:3 · 28:9
2 Kings 21:6 · 23:24
2 Chronicles 33:6
Isaiah 8:19 · 19:3
Acts 16:16