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Related to infante: SEATO
A son of a Spanish or Portuguese king other than the heir to the throne.
[Spanish and Portuguese, both from Latin īnfāns, īnfant-, infant; see infant.]
(Historical Terms) (formerly) a son of a king of Spain or Portugal, esp one not heir to the throne
[C16: from Spanish or Portuguese, literally: infant]
n., pl. -tes.
any son of the king of Spain or of Portugal who is not heir to the throne.
[1545–55; < Sp or Portuguese]