Examples from the Web for reactant
"She's been stripped of her reactant pile, Major," said Strong.
And far below on the power deck, Astro began to feed the reactant energy into the firing chambers.The Space Pioneers|Carey Rockwell
"Empty the reactant fuel tanks of all but enough for us to raise ship and touch down over to the fairgrounds," said Strong.On the Trail of the Space Pirates|Carey Rockwell
When it had reached the proper level, he switched in the reactant feed, giving it full D-12 rate.
If you return here with less than a quarter supply of reactant fuel, you will be disqualified.Treachery in Outer Space|Carey Rockwell and Louis Glanzman