Pronunciation: (ī'su-tīp"), [key]
1. a drawing, diagram, or other symbol that represents a specific quantity of or other fact about the thing depicted: Every isotype of a house on that chart represents a thousand new houses.
2. a statistical graph, chart, diagram, etc., that employs such symbols.
3. Biol.any of two or more separate populations of the same or a similar type.
4. Immunol.any antigenic determinant that is common to all individuals in a species.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.