Where does “mortiferousness” come from?

mortiferousness (English) comes from English mortiferous, from Latin mortifer, from Latin mortiferus, from Latin mors, from Proto-Italic mortis, from Proto-Indo-European mértis, from Proto-Indo-European mer- — to die; to disappear; sea, lake, wetland.

mortiferousness (English): The quality of being mortiferous

Definitions

  1. The quality of being mortiferous

Ancestry of “mortiferousness”, step by step

mortiferousness traces back through two separate lines of ancestry.

via English mortiferous

StepLanguageWordMeaning
1EnglishmortiferousCausing spiritual death; Causing physical death;...
2Latinmortiferdeadly, fatal, lethal
3LatinmortiferusAlternative form of mortifer
4Latinmorsdeath; corpse; annihilation
5Proto-Italicmortisdeath
6Proto-Indo-Europeanmértisdeath
7Proto-Indo-Europeanmer-to die; to disappear; sea, lake, wetland

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European mer-Every word from Proto-Indo-European mértisEvery word from Proto-Italic mortis