隔 means “separate, interval”

かく · kaku

Also: isolate, alternate, distance

Kun'yomi (Japanese reading)
へだてる, へだたる
On'yomi (Chinese reading)
カク

JLPT N1 · Taught in secondary school · 13 strokes

The story

A mound (阝) beside 鬲, an ancient cooking pot on three hollow legs: picture an earthen wall built between two fires. 隔 is a gap set between: 間隔 is spacing, 隔週 every other week, and 隔離 quarantine.

Used in 間隔 (kankaku, interval/spacing), 隔週 (kakushuu, every other week), and 隔離 (kakuri, isolation/quarantine)

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