multiplier

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that multiplies.
• noun Mathematics The number by which another number is multiplied. In 8 × 32, the multiplier is 8.
• noun Physics A device, such as a phototube, used to enhance or increase an effect.

from The Century Dictionary.

• noun One who or that which multiplies or increases in number.
• noun An alchemist.
• noun The number in the arithmetical process of multiplication by which another is multiplied. Also multiplicator.
• noun A flat coil of conducting wire used as the coil of a galvanoscope. The tendency to deflection is proportional nearly to the number of coils.
• noun An arithmometer for performing calculations in multiplication.
• noun A multiplying-reel; an attachment to an anglers' reel which gathers in the slack with multiplied speed at each revolution of the crank. See reel.
• noun See the adjectives.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who, or that which, multiplies or increases number.
• noun (Math.) The number by which another number (the multiplicand) is multiplied. See the Note under Multiplication.
• noun (Physics) An instrument for multiplying or increasing by repetition or accumulation the intensity of a force or action, as heat or electricity. It is particularly used to render such a force or action appreciable or measurable when feeble. See Thermomultiplier.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun arithmetic A number by which another (the multiplicand) is to be multiplied.
• noun grammar An adjective indicating the number of times something is to be multiplied.
• noun economics A ratio used to estimate total economic effect for a variety of economic activities.
• noun physics Any of several devices used to enhance a signal

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the number by which a multiplicand is multiplied