external phase

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ex·ter·nal phase

the medium or fluid in which a disperse is suspended.

external phase

ex·ter·nal phase

(eks-tĕr'năl fāz)
The medium or fluid in which a disperse is suspended.
Synonym(s): dispersion medium.
References in periodicals archive ?
All animals at 12 [per thousands]-20 [per thousands] exhibited overlap between seawater and mesogleal osmolality, although paired t-tests indicated that the osmolality of mesogleal fluid was significantly lower than that of the corresponding external medium at 15 [per thousands] and 20 [per thousands] (P [less than] 0.
In all cases, mesogleal sulfate levels were significantly lower than levels in the external medium.
A similar pattern was seen here, although between 15 [per thousands] and 12 [per thousands] Chrysaora quinquecirrha mesoglea switched from being hypo-osmolar to hyperosmolar relative to the external medium.