These are aluminum atoms. An atom is the smallest particle of an element that has the properties of that element. Some properties of aluminum are: shiny, silver colored, fragile, and thin. Each element has its own type of properties. Chemists use symbols to represent elements.
1 A person who has passed away and who is no longer alive is someone who would be described as dead.  When your career has faltered, you've been fired and have no hope of gaining your position back, this is an example of a time when your career is dead.
Learner's definition of KILLER. [count]. 1. : a person or thing that kills someone or something. The police finally captured the killer. [= murderer ]. Heart disease is the leading killer of both men and women. The chemical is used as a weed killer. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. killer /ËkÉªlÉ/ adjective. killer. /ËkÉªlÉ/. adjective. Learner's definition of KILLER. always used before a noun chiefly US. 1. : causing death or destruction. a killer tornado.