'yolk-laden' is a modern English compound formed from 'yolk' and 'laden'. 'yolk' originates from Old English 'geolca', related to 'geolu' meaning 'yellow'; 'laden' comes from Old English 'hladan' (to load).

'yolk' developed in Old English from a root related to 'yellow' and remained in use through Middle English; 'laden' is the past participle/adjectival form of the verb 'lade' (Old English 'hladan'), and combining the two produced the descriptive compound 'yolk-laden' in modern English.

Originally the elements meant 'yellow part (of an egg)' and 'loaded/filled'; together they have retained the combined meaning 'filled with yolk' in current usage.