DEFLECTOR
deflector
(noun) a device intended to turn aside the flow of something (water or air or smoke etc)
Source: WordNet® 3.1
Etymology
Noun
deflector (plural deflectors)
Something which deflects something else, especially a stream of fluid or particles.
A diaphragm in a lamp, stove, etc. by which the flame and gases are brought together to improve combustion.
(science fiction) A force field; an invisible barrier used as a protective shield.
Source: Wiktionary
De*flect"or, n. (Mech.)
Definition: That which deflects, as a diaphragm in a furnace, or a come in
a lamp (to deflect and mingle air and gases and help combustion).
Source: Webster’s Unabridged Dictionary 1913 Edition