susceptor

plural susceptors

1. One who undertakes anything; specifically, a godfather; a sponsor; a guardian.

   such susceptors were thought to put an obligation on the credits

   1655, Thomas Fuller, The Church-history of Britain; […], London: […] Iohn Williams […], →OCLC, (please specify |book=I to XI)

   1 more example

   I had given me the name of my grandfather, my mother's father, who, together with a sister of Sir Thomas Evelyn of Long-Ditton, and Mr. Comber, a near relation of my mother, were my susceptors.

   1641, John Evelyn, The Diary of John Evelyn, Vol. 1, Macmillan and Co., published 1906, page 5

2. A material used for its ability to absorb electromagnetic energy and convert it to heat, used in industrial heating and cooking.