Where does “cornu cervi” come from?

cornu cervi (Latin) comes from Latin cervus, from Latin -a, from Proto-Italic -ā, from Proto-Indo-European -éh₂.

Ancestry of “cornu cervi”, step by step

cornu cervi traces back through two separate lines of ancestry.

via Latin cervus

StepLanguageWordMeaning
1Latincervusdeer, stag; forked stakes; cheval de frise
2Latin-asuffixed to the roots of verbs, forms agent...
3Proto-Italic-āForms masculine agent nouns from prefixed or compounded bases
4Proto-Indo-European-éh₂—

via Latin cornū

StepLanguageWordMeaning
1Latincornūhorn; antler
2Proto-Italic*kornūhorn
Every word from Proto-Indo-European -éh₂ →Every word from Latin -a →Every word from Latin cervus →