decoct

verbs

extract the essence of something by boiling it
is derived from
is a type of (narrower)
bring to, or maintain at, the boiling point
"boil this liquid until it evaporates"
be cooked until very little liquid is left
"The sauce should reduce to one cup"
steep in hot water
is a type of (narrower)
let sit in a liquid to extract a flavor or to cleanse
"steep the blossoms in oil"; "steep the fruit in alcohol"