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.
A line of constant longitude is often called a "meridian". A line of constant latitude is often called a "parallel".
The lines of longitude are also known as a meridian line.
another name for a line of longitude is meridian.
A Line of longitude is an invisible line going north to south on the earth. The main one is called the prime meridian.
Longitude is Verticle. the 0 degree runs north to south. Its the Prime Meridian, also called the Rose line in some contexts.
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.