"Aluminum hood" refers to the front part of a car, specifically the covering over the engine area, made from the lightweight metal, aluminum. Full definition
The new aluminum hood helps cut the overall weight. (thesupercars.org)
Meanwhile the nose of the 2015 Legacy resembles that of the Legacy concept in the way the grille and headlights present an equally sleek face beneath a new, lightweight aluminum hood. (automobilemag.com)
A lightweight carbon fiber hatch and aluminum hood help decrease weight to increase efficiency. (toyotaofnaperville.com)