adjective
EXAMPLES FROM CORPUS
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He had a highly retentive memory and was an accomplished and lively speaker.
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He had a very retentive memory.
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Soil should be rich and moisture retentive , but free-draining.
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The pores between silt particles are so small and retentive of water that tightly packed silt can not be emptied by drainage.
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This gives a moisture retentive medium, but allows excess water to drain from the roots.