n. Usually as a mass noun. Hard, shiny, malleable material of the kind originally represented by gold, silver, copper, etc. (see sense A. 1b), esp. as used in the manufacture of objects, artefacts, and utensils.

Small, Laura, Kevin Olp. "Mapping Environmental Justice: How Can You Use EPA’s EJSCREEN Tool?" Environmental and Energy Study Institute (EESI), May 19, 2016. Video or Audio, 59:47.

Texts and other related media
Dissell, Rachel, Brie Zeltner, The Plain Dealer. “A look at lead poisoning through the years: Toxic Neglect (photos).”, January 11, 2019.
Dissell, Rachel, Brie Zeltner. “Cleveland City Council legislation aims for “systemic change” in approach to lead poisoning.”, June 3, 2019.
Feigl-Ding, Eric. "Lead Contamination Beyond Flint." The Forum, Harvard TH Chan School, April 20, 2017. Video, 8:47.
Gioielli, Robert. “Get the Lead Out: Environmental Politics in 1970s St. Louis.” Journal of Urban History 36, No. 4, 2010.
Kennedy, Merrit. “Lead-Laced Water In Flint: A Step-By-Step Look At The Makings Of A Crisis.” NPR Radio, April 20, 2016.
McClintock, Nathan. “Assessing soil lead contamination at multiple scales in Oakland, California: Implications for urban agriculture and environmental justice.” Applied Geography 35, Iss. 1-2 (2012): 460-473.
NRDC attorneys and local residents. "Fighting for Justice in Flint." Natural Resources Defense Council, November 13, 2017. Video, 13:25.