Æl-ceald

According to the Old English Dictionary:

æl-ceald

adj. [æl=eal] All cold, most cold; usquequaque frigidus :-- Meahtest weorþan æt ðæm ælcealdan steorran ðone Saturnus hátaþ you might be at that all-cold star which they call Saturn, Bt. Met. Fox 24, 37; Met. 24,19. æl-ceald