A hypothetical or archaic term relating to clotted or lumpy matter; a pseudo-Latin or jocular formation.
A fanciful or archaic coinage adding the Latin -ium suffix to grum- (relating to clotting/lumping), creating a mock-scientific or obsolete term.
Medieval and Renaissance scientists loved creating Latin-sounding terms for things they didn't quite understand—'grumium' has that flavor of pseudo-science, the kind of word that sounds authoritative but was probably invented by one scholar and never caught on widely.
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