D defs.my
Entry 1 sense Webster, 1913

Emulsion

/ĭm-ŭl'-shən/ · E·mul·sion · IPA /ɪmˈʌlʃən/
01 n. Any liquid preparation of a color and consistency resembling milk; as: (a) In pharmacy, an extract of seeds, or a mixture of oil and water …
  1. 1.
    Any liquid preparation of a color and consistency resembling milk; as: (a) In pharmacy, an extract of seeds, or a mixture of oil and water united by a mucilaginous substance. (b) In photography, a liquid preparation of collodion holding salt of silver, used in the photographic process.