Where does “pentacosanoic” come from?

pentacosanoic (English) comes from English pentacosane, from English -cosa-, from English icosa-, from Ancient Greek εἴκοσι, from Proto-Hellenic ewīkəti, from Proto-Indo-European wídḱm̥ti, from Proto-Indo-European dwidḱómt, from Proto-Indo-European déḱm̥t — ten.

pentacosanoic (English): Of or pertaining to pentacosanoic acid or its...

Definitions

  1. Of or pertaining to pentacosanoic acid or its...

Ancestry of “pentacosanoic”, step by step

pentacosanoic traces back through two separate lines of ancestry.

via English pentacosane

StepLanguageWordMeaning
1EnglishpentacosaneAny of very many isomeric forms of a saturated...
2English-cosa-
3Englishicosa-API; twenty
4Ancient Greekεἴκοσιtwenty
5Proto-Hellenicewīkəti
6Proto-Indo-Europeanwídḱm̥titwenty
7Proto-Indo-Europeandwidḱómt
8Proto-Indo-Europeandéḱm̥tten

via English OIC

StepLanguageWordMeaning
1EnglishOICAbbreviation of officer in the case; Abbreviation...
Every word from Proto-Indo-European déḱm̥tEvery word from Proto-Indo-European dwidḱómtEvery word from Proto-Indo-European wídḱm̥ti