This is the 7913th most frequent Spanish word.
meriño
"Meriño" does not have a widely-recognized definition in standard Spanish; it may be a proper noun, regional term, or typo.
Here, 'merinas' refers to a specific breed of sheep, indicating their type.
El pastor cuidaba de su rebaño de ovejas merinas en el campo.
The shepherd looked after his flock of Merino sheep in the field.
In this sentence, 'merina' describes the type of wool that the sweater is made from, emphasizing its high quality.
Compré un suéter hecho de lana merina porque es muy cálido.
I bought a sweater made of Merino wool because it is very warm.
Here, 'merina' specifies the kind of wool favored by the textile industry for its properties.