See Also: prefocus(dictionary)

prefocus (iou)



prefocus adjective & verb. M20.
[from PRE- 1 + FOCUS noun, verb.]
A. adjective. Designating or pertaining to a bulb so constructed that a lamp (esp. a vehicle headlamp) is automatically focused when fitted with it. M20.
b. verb trans. Infl. -s-, -ss-. Focus beforehand; spec. make or adjust (a lamp, bulb, etc.) to ensure automatic focusing of the lamp when the bulb is fitted. M20.