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.a hard or padded protective hat, various types of which are worn by soldiers, police officers, motorcyclists, sports players, and others.Modern helmets are designed to absorb energy and distribute impact forces to reduce the risk of brain injuries, skull fractures, contusions, and lacerations. They have a hard outer shell to resist penetration and an inner liner to absorb energy.2.BOTANYthe arched upper part (galea) of the corolla in some flowers, especially those of the mint and orchid families.