We don't have synonyms for britannicus yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are britannic, britannica and britannias.
(N) :
Tiberius Claudius Caesar Britannicus (12 February AD 41 – 11 February AD 55), usually called Britannicus, was the son of Roman Emperor Claudius and his third wife, Valeria Messalina.
(N) :
a five-act tragic play by the French dramatist Jean Racine.
(N) :
Tiberius Claudius Caesar Britannicus (12 February AD 41 – 11 February AD 55), usually called Britannicus, was the son of Roman Emperor Claudius and his third wife, Valeria Messalina.
(N) :
a five-act tragic play by the French dramatist Jean Racine.