Plural of distensibility; the qualities or degrees of being capable of being distended or stretched.
From distensible + -ity (noun suffix) + -s (plural). The chain distend → distensible → distensibility → distensibilities shows English's ability to build increasingly abstract nouns.
Medical science needs words like 'distensibilities' to talk about different tissues' ability to stretch—lung tissue has different distensibility than bladder tissue, which is why doctors study this precisely.
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