Where does “brittle star” come from?

brittle star (English) comes from English brittle, from English -le, from Middle English -el, from Old French -el, from Latin -ellus, from Latin -ulus, from Proto-Italic -olos, from Proto-Italic -elos — Forms agent nouns from verbal roots.

brittle star (English): Any of various echinoderms, of the class Ophiuroidea, that resemble starfish and have long, slender arms that regenerate when snapped off

Definitions

  1. Any of various echinoderms, of the class Ophiuroidea, that resemble starfish and have long, slender arms that regenerate when snapped off

Ancestry of “brittle star”, step by step

brittle star traces back through two separate lines of ancestry.

via English brittle

StepLanguageWordMeaning
1EnglishbrittleInflexible, liable to break or snap easily under...
2English-leA frequentative suffix of verbs, indicating...
3Middle English-el
4Old French-elSuffix that usually denotes a masculine noun
5Latin-ellusAlternative form of -ulus; "forming masculine...
6Latin-ulusUsed to form a diminutive of a noun, indicating...
7Proto-Italic-olos
8Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
9Proto-Indo-European-e-lós
10Proto-Indo-European-lósForms agent nouns from verbal roots

via English star

StepLanguageWordMeaning
1EnglishstarAny small luminous dot appearing in the cloudless...
2Middle Englishsterrestar
3Old Englishsteorrastar
4Proto-West Germanicsterrō
5Proto-Germanicsternôstar
6Proto-Indo-Europeanh₂stḗrstar
7Proto-Indo-Europeanh₂eHs-to be/become dry; to burn, to glow; hearth
Every word from Proto-Indo-European -lós