/məˈrɪdiən ||; məˈrɪdɪən/noun [C] a line that we imagine on the surface of the earth that joins the North Pole to the South Pole and passes through a particular place 经线；子午线: the Greenwich meridian 格林尼治子午线 ☞ Look at longitude. 参看longitude。 ☞picture at earth 见earth插图