The word says its own picture: turn plus table, a flat round surface that goes round. Put something on it and you can change which way that thing faces without lifting it or walking round it. A dish in a microwave, a plate of shrimp on a big dinner table, a vase in front of a camera, a record, a train engine — the object changes size and the job changes, but the platform underneath is always the same idea.
From the word’s history
Wiktionary gives the whole origin as turn plus table, so the compound has always meant exactly what its two parts say. That is why the general platform, and not the record player, is the sense the others sit on.
字典記的來源就是 turn 加 table，兩個部分合起來是什麼意思，這個字就是什麼意思。所以最基礎的那一層是「一般會轉的平台」，唱盤和轉車台都是這塊平台被派去做某一件事。
Wiktionary entry for turntable, supplied in this batch's evidence packet: From turn + table.
登入就可以看每一支怎麼連回核心畫面。