noun
also de·hy·drat·er dēˈhīˌdrād.ə(r), -ātə-
( -s )
: one that dehydrates or operates dehydrating apparatus: as
a. : an operator of a still for removing water from lubricating oils
b. : an agent (as silica gel) for dehydrating
c. : a device or apparatus for dehydrating : dryer