Definition
A light, colorless, flammable alcohol (chemical formula CH3OH) used in aviation primarily as an additive — most notably mixed with water and injected into the induction systems of certain reciprocating engines to provide a temporary boost in power output during takeoff. It is also encountered as a solvent and as a component in some deicing fluids.
Plain English
A type of alcohol that, when sprayed into an engine's air intake along with water, lets the engine produce extra power for short periods such as takeoff.
Context Anchor
Seen in aircraft powerplant maintenance, especially around water-methanol systems, fluid servicing, and safety handling instructions.
Derivation
From 'methyl' (the simplest hydrocarbon group) plus '-ol' (the chemistry suffix for alcohols). Knowing the '-ol' ending tells you it belongs to the alcohol family, which is why it burns and why it mixes well with water.
Why Pilots Care
Enables higher manifold pressure without detonation by cooling the intake charge, directly increasing available takeoff and climb power.
Grounding Statement
Methanol may look like ordinary clear liquid, but in aircraft work it should be treated as something that can burn and poison you.
Intuition Check
Methanol is not the drinkable kind of alcohol. If the word appears in maintenance or engine material, think toxic, flammable aircraft fluid—not beverage alcohol.
Example Sentence 1
Before takeoff, the mechanic confirmed the water-methanol tank was filled and the injection system was armed.
Example Sentence 2
The technician verified the methanol level in the ADI tank before the next flight.