Where does “January disease” come from?

January disease (English) comes from English disease, from Middle English disese, from Anglo-Norman desese, from Old French desaise, from Old French eise, from Latin adiacēns, from Latin adiaceo, from Latin ad- — in.

January disease (English): An acute form of East Coast fever in Zimbabwe

Definitions

  1. An acute form of East Coast fever in Zimbabwe

Ancestry of “January disease”, step by step

January disease traces back through two separate lines of ancestry.

via English disease

StepLanguageWordMeaning
1EnglishdiseaseAn abnormal condition of a human, animal or plant...
2Middle Englishdisese
3Anglo-Normandesese
4Old Frenchdesaisedisease; deformity; melancholy
5Old Frencheiseease
6Latinadiacēnsadjacent, adjoining, neighbouring
7LatinadiaceoI lie beside, at, near or next to; am adjacent...
8Latinad-to; usually prefixed to verbs, in which cases it...
9Latinīn-un-, non-, not
10Latinînin, at, on, upon, from (space)
11Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
12Proto-Italicenin
13Proto-Indo-Europeanh₁énin

via English January

StepLanguageWordMeaning
1EnglishJanuaryThe first month of the Gregorian calendar, following the December of the previous year and preceding February
2Middle EnglishIeneuer
3Anglo-Normangenever
4Latiniānuāriusof January
5Latin-āriuser
6Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)
Every word from Proto-Indo-European h₁én