From Wiktionary, the free dictionary
hw- (indefinite deictic 3rd-person possessive pronoun, one's) + íí- (“away out of sight”, thematized prefix) + sh- (1st person singular subject pronoun) + -gháán (noun stem of root -GHÁÁN, “back, spine”)
hwííshgháán
- (anatomy) back, backbone, spine, vertebrae
