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A carcinoma is a kind of cancer: a that starts in the cells that line the body, such as the skin or the inside of an organ. Doctors use this word in reports and textbooks; ordinary people almost always just say cancer. Not every cancer is a carcinoma — there are other families, such as sarcoma — but many of the common ones are. It is a formal medical noun, not a word for everyday worry-talk. You may hear it with a body part in front (lung carcinoma, skin carcinoma) to say where it began.
癌瘤（醫學用語；一般人多說「癌症」）
組成A learned borrowing from Latin carcinoma, from Greek karkínōma. That comes from karkinos, “crab,” plus a noun ending: old doctors said the veins around a tumour looked like a crab’s legs. English cancer is a doublet — same old idea, a different path into English.
同家族的字
- cancera doublet: same older ‘crab / tumour’ idea, the everyday English word
- carcinogenicshares carcino-; means ‘likely to cause cancer’
- carcinogenshares carcino-; a thing that can cause cancer
原始詞典資料2 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。
carcinomanoun/ˌkɑːsɪˈnəʊmə/
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medicineoncologysciencesAn invasive malignant tumour derived from epithelial tissue that tends to metastasize to other areas of the body.
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obsoletemedicineoncologysciencesA form of cancer; (uncountable) cancer in general as a disease.
- Take the fatteſt and fulleſt Figs you can get, lay them upon the ugly and ill favored tumor called Carcinoma, i. the Canker, ſo it be not yet exulcerat, I aſſure you it is a ſoveraine remedie, and hardly can be matched againe: […]
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。