The story
- Proto-Indo-European*steh₂-
- Ancient Greekῐ̔στός (hĭstós)
- Englishhisto-
- Englishhistidine
- Proto-Indo-European*swel-der.?
- Ancient Greekῡ̔́λη (hū́lē)
- Englishhistidyl
- Proto-Italic*wre-
- Latinre-
- Old Frenchre-
- Proto-Indo-European*(s)leg-
- Proto-Indo-European*(s)leg-s-ós
- Latinlaxus
- Latinlaxō
- Vulgar Latin*laxicāre
- Vulgar Latin*lassicāre
- Old Frenchlaschier
- Old Frenchrelaschier
- Old Frenchrelaisser
- Middle Englishrelesen
- Englishrelease
- English todayhistrelin
From hist(idyl) + -relin (“LHRH release–stimulating peptide”).
Etymology from Wiktionary, CC BY-SA 4.0.