Windshield

n. panel of glass protecting the occupants of a vehicle from the elements

The windshield (also known as the windscreen) of an aircraft, automobile, bus, motorcycle, or tram is the front window. Modern windshields are generally made of laminated safety glass, which consists of two (typically) curved sheets of glass with a plastic layer laminated between them for safety, and are glued into the window frame.
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The combination of individual units of glazing material of the locomotive, passenger car, or caboose that are positioned in an end facing glazing location. (49CFR223)

Noun
1. transparent screen (as of glass) to protect occupants of a vehicle
(synonym) windscreen
(hypernym) screen
(part-holonym) motor vehicle, automotive vehicle