This is the 1229th most frequent Portuguese word.
ouvido
"Ouvido" means "ear" (the organ for hearing).
Here, 'ouvido' is conjugated in the past tense of the verb 'ouvir' and refers to the act of hearing something.
Eu ouvi algo estranho enquanto caminhava.
I heard something strange while walking.
In this usage, 'ouvido' refers to the human ear as a physical part of the body and its ability to sense sound, often metaphorically referring to a skill.
Ele tem um ouvido apurado para música.
He has a sharp ear for music.
Here, 'ouvido' refers specifically to the anatomical part of the body, describing the organ being examined.