nominative singular neuter, or mūlaṃ + iti (root + quotative particle)
Analysis. mūlaṃ + iti: the nominative/accusative form mūlaṃ (root) followed by the quotative particle iti (thus, so), used to cite or emphasize the word itself; common in Pali for setting off key terms or definitions.
Etymology. From Indo-European *mul- (to grind, mill), related to Sanskrit mūla, Latin molō (mill), English mill and molar. The root image is of grinding down to a base or fundamental particle; hence 'root' as the ground or foundation of a plant, and metaphorically of knowledge, action, and existence. In the canon, mūla appears in doctrinal compounds: mūlajāti (root-birth), and in the three roots of unwholesomeness (lobha, dosa, moha—greed, hatred, delusion—as the mūla of dukkha).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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