最古 さいこ Meanings Noun, の-adjective the oldest; the earliest Kanji 最 most. Read as サイ. 古 old. Read as コ. Example sentences それは現存する最古の木造建築である。It is the oldest wooden building in existence. 法隆寺は世界最古の木造建築である。The Horyuji is the oldest wooden building in the world. Words containing 最古 人類最古 (じんるいさいこ) oldest mankind (e.g. evidence of) 最古参 (さいこさん) oldest member of a group Word lists Encyclopedia Jinuma: Japanese Dictionary · Word lists