A line of constant longitude is often referred to as a 'meridian'.
meridian
The so-called 'lines' of longitude are also called 'meridians'. The Prime Meridian is a line of longitude. It's the line made out of all the points on Earth whose longitude is zero.
prime meridian
Longitude is the best term, but sometimes meridian is used. The line of longitude at zero degrees is the Prime Meridian.
another name for a line of longitude is meridian.
Lines of longitude are often called "meridians", but never "parallels". "Parallels" are lines of constant latitude.
The lines of longitude are also known as a meridian line.
A Line of longitude is an invisible line going north to south on the earth. The main one is called the prime meridian.
longitude mean north and south. lattitude mean east and west. there is also the prime meridian. it follows longitude.
The 0' line of longitude is called the Greenwich Meridian because it passes through Greenwich, Lonon
The line of 180 longitude is sometimes called the "anti-meridian". It is also (with a number of variations) the International Date Line.
International Date Line