__ Resistojet; Yvonne Brill’s Rocket Engine
Puzzle 7 of Women Inventors Hard Pack
Question is: __ Resistojet; Yvonne Brill’s Rocket Engine
and the answer is: HYDRAZINE
Word Meaning:
HYDRAZINE — (inorganic chemistry, uncountable) A corrosive, fuming liquid, NH₂-NH₂, used as a rocket fuel.
Definitions from Wiktionary.