Nominative rēx and genitive rēgis belong to one paradigm: stem-final g before nominative -s devoices to k, and Latin writes the resulting /ks/ cluster as x; intervocalic g remains visible in rēgis.
CANONICAL RELATIONSHIP RECORD
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A relationship—not a generated explanation. Both endpoints, every editorial field, every citation, and every dossier reuse are preserved below.
rēx
king
OPEN NODE 757 ↗rēgis
of a king; genitive singular of rēx
OPEN NODE 1041 ↗THE COMPLETE RELATIONSHIP
EVERY FIELD, NOT A FAIRY TALE
Both forms mean king in different grammatical cases; no semantic ancestry runs from one case form to the other.
Synchronic Latin morphology illuminated by historical sound change.
Norvin W. Richards · Charlton T. Lewis · Charles Short
established — The edge is a navigational paradigm relation, not a claim that genitive rēgis historically produced nominative rēx.
reviewed
CITATION REGISTER
SOURCES ON THIS EDGE
Supplies the paired nominative and genitive forms and their shared lexical identity.
Derives nominative rēx from stem reg- plus -s, explains devoicing of g, and identifies x as the spelling of /ks/.
EDITORIAL REUSE