How to say "skeleton" in Arabic

Haykal and היכל aren't a shared Semitic root — they're something arguably closer: shared loanwords from the very same source, Akkadian ekallu 'palace', itself from Sumerian É.GAL, 'big house'. Hebrew היכל kept the grand original sense (palace, temple, sanctuary — the Temple in Jerusalem is הֵיכָל ה'), while Arabic haykal drifted from 'great edifice' toward 'framework, structure', and today mostly just means 'skeleton'. Say haykal ʿaẓmī and you mean a skeletal frame, not a sanctuary.