end member

American

noun

Mineralogy.

either of two pure compounds occurring in various proportions in a series of solid solutions that comprises a mineral group.

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end member

Now as it happens, the end member is easily selected by the monkey, and it appears further that alternation was relatively easy for Sobke to acquire.

From The Mental Life of Monkeys and Apes A Study of Ideational Behavior by Robert M. Yerkes

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023