doublet
US /ˈdʌb.lət/
UK /ˈdʌb.lət/

1.
doblete
a pair of similar things, especially two similar words or forms in a language that have developed from the same original word
:
•
The words 'fragile' and 'frail' are doublets, both coming from the Latin 'fragilis'.
As palavras 'fragile' e 'frail' são dobletes, ambas vindo do latim 'fragilis'.
•
Linguists often study doublets to understand language evolution.
Linguistas frequentemente estudam dobletes para entender a evolução da linguagem.
2.
gibão
a man's short close-fitting padded jacket, worn from the 14th to the 17th centuries
:
•
The knight wore a silk doublet under his armor.
O cavaleiro usava um gibão de seda sob sua armadura.
•
Historical paintings often depict men in elaborate doublets.
Pinturas históricas frequentemente retratam homens com gibões elaborados.