How to Say "gallnut" in Spanish
The Spanish word for “gallnut” is “agallas” — B1 level.
English → SpanishB1
nounB1
plant growth/excrescence (less common meaning)

Examples
Las agallas del pez son de color rojo brillante.
The fish's gills are bright red.
El pescador revisó las agallas para ver si el pescado estaba fresco.
The fisherman checked the gills to see if the fish was fresh.
Anatomy Terminology
In biology, 'agallas' refers specifically to the organs fish use to breathe underwater. It is usually used in the plural.
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