Where does “oligoelement” come from?

oligoelement (English) comes from English oligo, from English oligonucleotide, from English nucleotide, from English nucleo-, from Latin nū̆cleus, from Latin nuculea, from Latin -eus, from Ancient Greek -εῖος — Creates adjectives from verb stems.

Ancestry of “oligoelement”, step by step

oligoelement traces back through two separate lines of ancestry.

via English oligo

StepLanguageWordMeaning
1EnglisholigoAn oligonucleotide
2EnglisholigonucleotideA short sequence of nucleotides (RNA or DNA), typically with twenty or fewer base pairs
3EnglishnucleotideThe monomer constituting DNA or RNA biopolymer...
4Englishnucleo-Forming words pertaining to nuclei
5Latinnū̆cleus(small) nut
6Latinnuculeapertaining to a small nut
7Latin-eusargentum + API → argenteus; ferrum + API →...
8Ancient Greek-εῖοςForms adjectives, usually with a meaning of "of"...
9Proto-Indo-European-iHwós
10Proto-Indo-European-wósCreates adjectives from verb stems

via English element

StepLanguageWordMeaning
1EnglishelementOne of the simplest or essential parts or...
2Middle Englishelement
3Old Frenchelement
4Latinelementumone of four elements that composed the world;...
5Ancient Greekστοιχεῖονone of a row; one of a series, a component part,...
6Ancient Greekστοῖχοςrow in an ascending series; a line of poles...
7Proto-Hellenicstóikʰos
8Proto-Indo-Europeanstóygʰ-os
9Proto-Indo-Europeansteygʰ-to go; to climb
Every word from Proto-Indo-European -wósEvery word from Latin -eusEvery word from English nucleo-