Another word for a latitude line?

There isn't really a direct synonym for "latitude line" that's commonly used. However, you can use these phrases depending on the context:

* Parallel: This is the most accurate and technical term, as latitude lines are all parallel to the equator.

* Circle of latitude: This emphasizes the shape of the line.

* Latitude: While not a synonym for the "line" itself, you could use "latitude" in a sentence to refer to a specific line. For example, "The 40th parallel is a significant latitude."

Example:

Instead of saying: "The explorer crossed the equator, a latitude line."

You could say:

* "The explorer crossed the equator, a parallel of latitude."

* "The explorer crossed the equator, a circle of latitude."

* "The explorer crossed the equator, at latitude 0 degrees."