The word 'suffused' originates from the Latin verb 'suffundere', which is a compound of the prefix 'sub-' (meaning 'under') and the verb 'fundere' (meaning 'to pour'). The literal image is of a liquid being poured from underneath, causing it to well up and spread through something. This concrete meaning evolved metaphorically to describe the gentle, pervasive spreading of more abstract qualities like color, light, or emotion. The '-ed' suffix is a Germanic addition, marking the word as a past participle in English, completing its journey from a Latin description of a physical act to an English term for a pervasive, often emotional, saturation.

Structure: suf (under, up from under) + fus (pour) + ed (past tense suffix) - suf: A form of the Latin prefix 'sub-', meaning 'under, up from under, below'. It assimilates to 'suf-' before 'f'. - fus: From the Latin root 'fundere', meaning 'to pour, melt, cast'. - ed: An Old English suffix used to form the past tense and past participle of regular verbs.