inspissate

Verb
  1. Make viscous or dense (synset 200432563)
    "thicken the sauce by adding flour"
  2. Make thick or thicker (synset 200432280)
    "Thicken the sauce"; "inspissate the tar so that it becomes pitch"
  3. Become thick or thicker (synset 200432070)
    "The sauce thickened"; "The egg yolk will inspissate"

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