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im-1 a prefix that means "in," "into," or "on." It is used before words beginning with the letters P, B, or M.
im-2 a prefix that means "not" or "without." It is used before words that begin with the letters P, B, or M.
phosphorus a substance that is a chemical element. One of the common forms of phosphorus is a poisonous yellow solid that glows in moist air. Phosphorus is important to living things. It is used in fertilizers to help plants grow. (symbol: P)
p.m. the time between noon and midnight. P.M. is the abbreviation of "post meridiem," meaning "after noon" in Latin. [1/2 definitions]
P.S. written to introduce a note added to a letter that is below the writer's signature. "P.S." is an abbreviation of "postscript."
R.I.P. an abbreviation for Latin words that mean "rest in peace." R.I.P is used when a person dies and is often written on a person's gravestone.