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Guide lead steer pilot engineer mean to direct in a course or show the way to be followed guide implies intimate knowledge of the way and of all its difficulties and dangers guided the scouts through the cave lead implies showing the way and often keeping those that follow under control and in order led his team to victory steer implies an ability to keep to a course and stresses . Lead definition to go before or with to show the way conduct or escort to lead a group on a cross country hike see more. 4 to afford a passage course or route a road that leads over the mountains a door leading to the pantry. Lead is a naturally occurring element found in small amounts in the earths crust while it has some beneficial uses it can be toxic to humans and animals causing of health effects lead can be found in all parts of our environment the air the soil the water and even inside our homes . Inorganic lead is a malleable blue gray heavy metal that occurs naturally in the earths crust lead was one of the first metals used by humans and consequently the cause of the first recorded occupational disease lead colic in a 4th century bc metal worker. The childhood lead poisoning prevention program is committed to the healthy people goal of eliminating elevated blood lead levels in children by 2020 cdc continues to assist state and local childhood lead poisoning prevention programs to provide a scientific basis for policy decisions and to ensure that health issues are addressed in decisions about housing and the environment. Definition of lead cause a person or animal to go with one by holding them by the hand a halter a rope etc while moving forward be a route or. Lead is a highly toxic metal and a very strong poison lead poisoning is a serious and sometimes fatal condition it occurs when lead builds up in the body lead is found in lead based paints