Final answer:
The seasonally-appropriate six-letter Latin word for Castor and Pollux is 'gemini', which also is the name of their constellation.
Step-by-step explanation:
Castor and Pollux, the twin brothers in Greek mythology, are collectively known by the seasonally-appropriate six-letter Latin word gemini, which also represents their constellation in the sky.
They are referred to as the Dioscuri, and their tale is among the many myths that the ancient Greeks and Romans used to explain natural phenomena and human experiences, such as the changing seasons and the appearance of constellations.
They are associated with the constellation Gemini, which represents the twins in the sky. The six-letter Latin word that is seasonally appropriate for Castor and Pollux is 'vernal', which refers to the spring season.