undersaturation

undersaturated

[uhn-der-sach-uh-rey-tid]
adjective Chemistry.
unsaturated ( def 2 ).

Origin:
1820–30; under- + saturated

undersaturation, noun
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undersaturated (ˌʌndəˈsætʃəˌreɪtɪd)
 
adj
(of an igneous rock) having a low silica content

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