How to Say "bays" in Spanish
The Spanish word for “bays” is “senos” — C1 level.
English → SpanishC1
NounC1formal
archaic/geographical (plural of 'seno')

Examples
En este gráfico, los senos de los ángulos están representados por la onda azul.
In this graph, the sines of the angles are represented by the blue wave.
Estudiamos los senos y cosenos en la clase de trigonometría avanzada.
We studied sines and cosines in advanced trigonometry class.
Technical Usage
This meaning is specific to math. If you hear it outside of a geometry class, it almost certainly refers to the anatomical meaning.
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