noun
elder second cousin
Refers specifically to a male second cousin who is older than the speaker. Part of a precise kinship system; not commonly used in everyday conversation.
再従兄は父のいとこの息子で、私より五歳年上です。
My elder second cousin is the son of my father's cousin and is five years older than me.
Compound of 再 (sai, 'again' or 'second') and 従兄 (jūkei, 'elder male cousin'), literally 'second elder male cousin'. The exact historical derivation is uncertain, but the term follows the pattern of Japanese kinship terminology.