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-bula, -bla-, -ula, -la Instrumental suffix.
Fossilized in Spanish. From Latin -bula 'id.' From Proto-Italic *-þlo- 'id.' From Proto-Indo-European *-dhlo- 'id.'
Indo-European
Romance
Asturian -la-, Portuguese -la-, Galician -la-, Catalan -ula-, French -bl(e)-, Italian -ba-, Romanian -bulă (learned borrowing)
Balto-Slavic
Lithuanian -mi, Old Church Slavonic -mĭ
Hellenic
Mycenaean -pi
Armenian
Armenian -b
Indo-Iranian
Sanskrit (inst. pl.) -dhís

Present in words like fábula, but less obviously in words like the -bl- in hablar.