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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English thickenen, thikkenen, perhaps from Old Norse þykkna (“to thicken”); equivalent to thick + -en. Cognate with Swedish tjockna (“to thicken”), Icelandic þykkna (“to thicken”).
inspissate
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Classic usage
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