Device Controlling the Flow of Fuel to an Engine
This page is the CodyCross answer for the clue below from Botanical Garden, Group 1437, Puzzle 3 (Carnations).
Question is: Device Controlling the Flow of Fuel to an Engine
and the answer is: THROTTLE
Word Meaning:
THROTTLE — A valve that regulates the supply of fuel-air mixture to an internal combustion engine and thus controls its speed; a similar valve that controls the air supply to an engine.
Definitions from Wiktionary.