The term 'Decimal Part of a Logarithm' can be summarized as the MANTISSA, which is an 8-letter word. A logarithm is a mathematical operation that expresses the power to which a number must be raised in order to produce a given number. The mantissa is the decimal part of the logarithm, which is the part after the decimal point. It is used to represent the fractional part of the logarithm and is usually expressed as a decimal fraction.