Home › Words › P › pentastarchpentastarchpentastarch means A hydroxyethyl starch with five hydroxyethyl groups out of each 11 hydroxyls.Among words judged in Lexicurio's Arena, pentastarch ranks #36,618 of 42,749 for Qualifying.EtymologyFrom penta- + starch.nounA hydroxyethyl starch with five hydroxyethyl groups out of each 11 hydroxyls.Definitions & examples from Wiktionary (CC BY-SA 3.0).