頬骨

/kepukotu/ → /keɸukot͡su/ → /keukot͡su/ → /kjoːkot͡su/

From Middle Chinese compound 頰骨 / 颊骨 (kiep? kwot, literally “cheek + bone”).

• (Tokyo) きょーこつ [kyóꜜòkòtsù] (Atamadaka – [1])^[1]
• IPA^(key): [kʲo̞ːko̞t͡sɨ]

頬(きょう)骨(こつ) • (kyōkotsu) ^{←けふこつ (kefukotu)?}

1. cheekbone

• 顴骨(かんこつ) (kankotsu) (less common, more formal)
• 頬骨(ほおぼね) (hōbone) (see below; more common)

Compound of 頬 (hō, “cheek, jaw”) +‎ 骨 (hone, “bone”).^[2][1] The hone changes to bone as an instance of rendaku (連濁).

• (Tokyo) ほおぼね [hòóbóné] (Heiban – [0])^[1]
• IPA^(key): [ho̞ːbo̞ne̞]

頬(ほお)骨(ぼね) • (hōbone) ^{←ほほぼね (fofobone)?}

1. cheekbone

• 頬骨(きょうこつ) (kyōkotsu) (less common, more formal)
• 顴骨(かんこつ) (kankotsu) (less common, even more formal)

Compound of 頬 (tsura, “face; cheek”) +‎ 骨 (hone, “bone”).^[2][1] The hone changes to bone as an instance of rendaku (連濁). The tsura reading for 頬 is rare.

• 面骨 (more common spelling)

• (Tokyo) つらぼね [tsùrábóné] (Heiban – [0])^[1]
• IPA^(key): [t͡sɨɾa̠bo̞ne̞]

頬(つら)骨(ぼね) • (tsurabone) 

1. cheekbone
2. one's facial features, one's looks

The cheekbone sense is more commonly expressed with the reading hōbone.

• (cheekbone): 頬骨(きょうこつ) (kyōkotsu) (see above; more formal)
• (features): 顔付(かおつ)き (kaotsuki), 顔立(かおだ)ち (kaodachi), 面立(おもだ)ち (omodachi)