雌 is used for animals and plants. For humans, use 女 (nǚ) instead. The pair 雌雄 (cíxióng) means 'female and male' and can figuratively mean 'superiority' in the phrase 一决雌雄 (to have a showdown).
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The right side 隹 means 'short-tailed bird'. The left side 此 (cǐ, this) is phonetic. Think: 'this bird' — the female one sitting on the nest.
