The Collaborative International Dictionary
Petunse
Petunse \Pe*tunse"\, Petuntse \Pe*tuntse"\, Petuntze \Pe*tuntze"\, n. [From Chinese.] Powdered fledspar, kaolin, or quartz, used in the manufacture of porcelain.
Wiktionary
petunse
n. Powdered feldspar, kaolin, or quartz, used in the manufacture of porcelain.