后 means “empress, queen”

こう · kou

Also: after, behind

Kun'yomi (Japanese reading)
きさき
On'yomi (Chinese reading)
コウ, ゴ

JLPT N1 · Taught in grade 6 · 6 strokes

The story

A figure leaning over a mouth (口): picture a voice giving orders from beside the throne. 后 is an empress: 皇后 is the Empress of Japan, and 皇太后 is the empress dowager, widow of the previous emperor.

Used in 皇后 (kougou, empress), 皇太后 (koutaigou, empress dowager), and 西太后 (seitaikou, Empress Dowager Cixi)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.