Where does “premenstruation” come from?

premenstruation (English) comes from English menstruation, from English -ation, from Middle English -acioun, from Old French -ation, from Latin -ātiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus — small stone, pebble; gravel, rubble.

Ancestry of “premenstruation”, step by step

premenstruation traces back through two separate lines of ancestry.

via English menstruation

StepLanguageWordMeaning
1EnglishmenstruationThe periodic discharging of the menses, the flow...
2English-ationAn action or process; The result of an action or...
3Middle English-aciounForms nouns denoting an action, act, or doing,...
4Old French-ationation
5Latin-ātiō
6Latin-tiōtion, -ation, -ing
7Latindissertātiō(spoken) dissertation, discourse, disquisition
8Latindissertusarranged, disposed; explained
9Latindissereresecond-person singular future passive indicative...
10Latindis-asunder, apart, in two; reversal, removal;...
11Latincalceusshoe
12Latincalxlimestone; chalk; the finish line
13Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English pre

StepLanguageWordMeaning
1EnglishpreBefore; Precum, Cowper's fluid, pre-ejaculate; To...
2Latinpraebefore; in front; in front of
3Proto-Italicpraibefore; in front of
4Proto-Indo-Europeanpreh₂-before, in front
5Proto-Indo-Europeanper-before, in front; first; to go through
6Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Ancient Greek χάλιξ