in algebra, a character in form of a line or stroke drawn over a factor, divisor, or dividend, when compounded of several letters or quantities, to connect them, and show that they are to be multiplied or divided, &c. together by the other term. Thus $a \times b - c$ shows that $d$ is to be multiplied into $a + b - c$, and is equivalent to $d(a + b - c)$.