Strong's Definition
from 3559; properly, a statue, i.e. idol; but used (by euphemism) for some heathen deity (perhaps corresponding to Priapus or Baal-peor)
KJV Usage: Chiun
STEPBible — Tyndale Abridged Hebrew Lexicon
כִּיּוּן (kiy.yun) — Kiyyun.
§ Chiun = "an image" or "pillar" probably a statue of the Assyrian-Babylonian god of the planet Saturn and used to symbolise Israelite apostasy
UBS Dictionary of Biblical Hebrew
name
Names of Deities | ≈ סִכּוּת
Kaiwan = epithet of an Assyrian/Babylonian astral deity Sakkuth, a manifestation of the planet Saturn; ≈ the Hebrew consonants carry the same vowel as the word שִׁקּוּץ, a pejorative reference to idols (ABD)
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
כִּיּוּן n.pr.dei Am 5:26, prob. = As. kaivânu, planet Saturn (Ar. and Pers. Arabic, Syr. Syriac), regarded as god; orig. pronunc. כֵּיוָן Schr COT ad loc., cf. Kö ii. 151 (pointing כִּיּוּן intended to suggest √ כון as something established, firm); kaimânu = kaiânu, acc. to Jen Cosm. iii. 502 who der. fr. כון (cf. Thes; so Zim BP 17); > Hpt ZA ii. 266, 281 f. rds. כַּיָּוָן (for כְּאָמָן *), reading Babyl. name Kaʼâmânu; v. also M-A JBL 1892, xi. 86 n. 39. done