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A sibling is a or a sister. It's a more formal, neutral word than saying '' or 'sister' directly, and it's useful when you don't know or don't need to say if the person is male or female - like in a form that asks 'Do you have any siblings?' You'll hear this word a lot in psychology, medicine, and official writing, less so in casual daily talk, where people usually just say 'my ' or 'my sister'.
手足(兄弟姊妹的正式說法)
組成It comes from an old English word 'sib', meaning related by family, plus the ending '-ling', which can mean 'a small one' (like in 'duckling').
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
siblingnoun/ˈsɪb.lɪŋ/
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A person who shares a parent; one's brother or sister who one shares a parent with.
- None of my siblings are married yet.
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computingcomputing-theoryengineeringA node in a data structure that shares its parent with another node.
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biologynatural-sciencestaxonomyThe most closely related species, or one of several most closely related species when none can be determined to be more closely related.
- D. simulans, D. mauritiana and D. sechellia (which we will call “the siblings” when we do not need to distinguish among them) have homosequential polytene chromosome banding patterns differing from those of D. melanogaster by one long inversion on chromosome arm 3R and a few much smaller inversions.
- Bush suggested that this difference might represent a case of chromosomal polymorphism or, more likely, sibling species.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。