emulsion
UK[ɪˈmʌlʃ(ə)n]US[ɪˈmʌlʃən]
n
A fine dispersion of minute droplets of one liquid in another in which it is not soluble or miscible.
n
A light-sensitive coating for photographic films and plates, containing crystals of a silver compound dispersed in a medium such as gelatin.
Morpheme Breakdown
e
muls
ion
e
out
muls
to milk
ion
noun suffix
Etymology
The word 'emulsion' originates from the modern Latin term 'emulsio', which itself derives from the Latin verb 'emulgēre', meaning "to milk out". The core Latin root 'mulgeō' (to milk) is of Proto-Indo-European origin, related to the act of drawing out a liquid. The prefix 'e-' (out) combined with this root creates the literal sense of "a liquid obtained by milking out". This perfectly describes the process of creating an emulsion, where one liquid is dispersed out into another. Over time, the term was adopted into scientific and photographic contexts to describe any stable mixture of two immiscible liquids, or the light-sensitive, milky-looking coating on film.
Analysis
Structure: e (out) + muls (to milk) + ion (noun suffix)
e: Latin prefix, a variant of 'ex-', meaning "out".
muls: From Latin 'mulsus', the past participle of 'mulgeō', meaning "to milk".
ion: Latin suffix forming nouns denoting action or condition.
Examples
The chef prepared a vinaigrette, a simple emulsion of oil and vinegar.
Mayonnaise is a stable emulsion of egg yolk, oil, and an acid like vinegar or lemon juice.
The quality of the photograph depends on the silver halide crystals suspended in the gelatin emulsion.