Where does “diatomist” come from?

diatomist (English) comes from English diatom, from English atom, from Middle English attome, from Middle French athome, from Latin atomus, from Ancient Greek ἄτομος, from Ancient Greek ἀ-, from Proto-Hellenic hə- — together, one.

diatomist (English): A phycologist who studies diatoms

Definitions

  1. A phycologist who studies diatoms

Ancestry of “diatomist”, step by step

diatomist traces back through two separate lines of ancestry.

via English diatom

StepLanguageWordMeaning
1EnglishdiatomAny of a group of minute unicellular algae having...
2EnglishatomThe smallest possible amount of matter which...
3Middle Englishattomeatom
4Middle Frenchathomeatom
5Latinatomusindivisible; an atom, particle incapable of being...
6Ancient Greekἄτομοςuncut; indivisible, not capable of being...
7Ancient Greekἀ-The alpha privativum, used to make words that...
8Proto-Hellenichə-same; together
9Proto-Indo-Europeansm̥-one; with, together
10Proto-Indo-Europeansem-together, one

via English ist

StepLanguageWordMeaning
1EnglishistA practitioner or supporter of an ism
2English-istAdded to words to form nouns denoting
3Old French-iste
4Latin-ista-ist; one who practises or believes
5Ancient Greek-ιστήςAlternative form of -τής; -ist
6Ancient Greek-τήςAppended to verbs to form agent nouns
7Proto-Hellenic-tās
Every word from Proto-Indo-European sem-Every word from Ancient Greek ἀ-Every word from Ancient Greek ἄτομος