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Spanish word testarudo comes from Spanish -udo, Spanish testa
-udo (Spanish)
(El Salvador, Honduras) A suffix appended to nouns of parts of the body to derive adjectives relating to having a big example of such parts:. A suffix appended to nouns to form adjectives (which can also be used as nouns), to indicate that someone or something has attributes such as existence or abundance, and sometimes indicates habits or attitudes, similar to English suffixes -y, -ous:.
testa (Spanish)
Head. Test (shell or endoskeleton of an echinoderm or certain plankton).
testarudo (Spanish)
Stubborn, obstinate.