bi propellant

bi·pro·pel·lant

[bahy-pruh-pel-uhnt]
noun Rocketry.
a missile or rocket propellant, composed of fuel and oxidizer, the components of which are kept in separate compartments prior to combustion.

Origin:
1945–50; bi-1 + propellant

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
bipropellant (ˌbaɪprəˈpɛlənt) [Click for IPA pronunciation guide]
 
n
Compare monopropellant Also called: dipropellant a rocket propellant consisting of two substances, usually a fuel and an oxidizer

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Bi propellant is always a great word to know.
So is doohickey. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
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