pectize

/ˈpɛktaɪz/
verb
  1. To convert into a jelly or gel; to cause a substance to set or thicken, especially by the action of pectin.
    • Some fruits naturally pectize when heated, while others need added pectin.
    • If you add sugar and boil the fruit, it will pectize into a firm jam.
    • The recipe says to let the mixture cool slowly so it can pectize properly.
Antonyms