formulae

Science Dictionary
formula   (fôr'myə-lə)  Pronunciation Key 
Plural formulas or formulae (fôr'myə-lē')
  1. A set of symbols showing the composition of a chemical compound. A formula lists the elements contained within it and indicates the number of atoms of each element with a subscript numeral if the number is more than 1. For example, H2O is the formula for water, where H2 indicates two atoms of hydrogen and O indicates one atom of oxygen.

  2. A set of symbols expressing a mathematical rule or principle. For example, the formula for the area of a rectangle is a = lw, where a is the area, l the length, and w the width.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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