We found one dictionary that defines the word castemate:

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1. castemate: Wiktionary

Definitions from Wiktionary (castemate) ▸ noun:  A member of the same caste. ▸ Words similar to castemate ▸ Usage examples for castemate ▸ Idioms related to castemate ▸ Wikipedia articles (New!) ▸ Popular adjectives describing castemate ▸ Words that often appear near castemate ▸ Rhymes of castemate ▸ Invented words related to castemate