Where does “morsūra” come from?

morsūra (Late Latin) comes from Latin -ura, from Latin -tūra — ing, -ure, -work.

Ancestry of “morsūra”, step by step

Step	Language	Word	Meaning
1	Latin	-ura	Suffix forming abstract nouns from adjectives
2	Latin	-tūra	ing, -ure, -work