Plural of excrescency; multiple instances of abnormal growth or outgrowth.
An alternative plural form of excrescency (itself a variant of excrescence), using the -ies ending instead of -es, from Latin excrescentia.
English has quirky plural rules inherited from Latin, so some people would say 'excrescences' and others 'excrescencies'—both are correct, but it shows how English still carries medieval and ancient patterns.
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