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di·a·gram (dīə-grăm)
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n.
1. A plan, sketch, drawing, or outline designed to demonstrate or explain how something works or to clarify the relationship between the parts of a whole.
2. Mathematics A graphic representation of an algebraic or geometric relationship.
3. A chart or graph.
tr.v. di·a·grammed, di·a·gram·ming, di·a·grams or di·a·gramed or di·a·gram·ing
To indicate or represent by or as if by a diagram.

[Latin diagramma, figure, from Greek, a figure worked out by lines, plan, from diagraphein, to mark out, delineate : dia-, dia- + graphein, to write; see gerbh- in the Appendix of Indo-European roots.]

dia·gramma·ble adj.
dia·gram·matic (-grə-mătĭk), dia·gram·mati·cal adj.
dia·gram·mati·cal·ly adv.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.