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Longman Dictionary of Contemporary English
graph paper
noun
EXAMPLES FROM CORPUS
▪ It is best to work out a pattern in advance and draw it out on same graph paper.
▪ It takes a bit of time to learn to use these more specialized sorts of graph paper but it is worth the effort.
▪ Probability graph paper exists to show the extent to which a distribution deviates from the Gaussian shape.
▪ Sitting down with a slip of graph paper and jotting down a few ideas will help, you make sense of your thoughts.
▪ Special types of graph paper can be useful in different circumstances.
▪ The use of graph paper makes accurate plotting possible - compare the tabulated results below and their plot in figure 14.
▪ This consisted of drawing on graph paper ten figures of slightly varying geometric size, made up of squares.
Wiktionary
graph paper

n. Paper ruled into small squares, usually of equal size, for use in drawing graphs or other charts.

WordNet
graph paper

n. paper that has lines to permit drawing graphs

Wikipedia
Graph paper

Graph paper, graphing paper, or millimeter paper is writing paper that is printed with fine lines making up a regular grid. The lines are often used as guides for plotting mathematical functions or experimental data and drawing two-dimensional graphs. It is commonly found in mathematics and engineering education settings and in laboratory notebooks. Graph paper is available either as loose leaf paper or bound in notebooks. It is becoming less common as computer software, such as spreadsheets and plotting software, has supplanted many of the former uses of graph paper. Some users of graph paper now print pdf images of the grid pattern as needed rather than buying it pre-printed. There are websites that will generate pdfs of graph paper to the user's specifications.