One way to hold this word: -er names whatever does the job, so a recorder can be thought of as the thing or the person that records. A machine keeps the sound. A student keeps the notes. A city judge keeps the court's decisions. The wooden pipe with holes is a different story that happens to end up with the same spelling.
From the word’s history
The source traces record to Latin recordor, 'to call to mind', built from re- ('back, again') and cor ('heart, mind'), and analyses recorder as record + -er.
來源資料說 record 來自拉丁文 recordor「再想起來」，由 re-（回、再）加 cor（心、腦中）組成，而 recorder 就是 record 加 -er。可以想成：先是放在心裡記住，後來寫下來，最後交給機器。
Wiktionary (kaikki extract), recorder, Etymology 1: 'From Middle English recordour … from Latin recordor … By surface analysis, record + -er.'
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原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，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。
recordernoun詞源 1/ɹiˈkɔː.də/
- 1
An apparatus for recording; a device which records.
- Between 8 and 9 p.m., the recorder at a meteorological station at Harrow, Middlesex, picked up 1,470 lightning flashes within a radius of 10 to 15 miles, and observers at the station described the storm as "probably one of the most spectacular of the century."
- A smartphone is not the best camera, notebook, word processor, audio recorder, radio, MP3 player, map reader, pedometer and so on, but it is good enough replace numerous separate devices for most people most of the time.
- 2
A judge in a municipal court.
recordernoun詞源 2/ɹiˈkɔː.də/
- 1
entertainmentlifestylemusicA musical instrument of the woodwind family; a type of fipple flute, a simple internal duct flute.
- Recorders are made in various sizes, from the high soprano or descant recorder to the low bass recorder.
- Indeed he hath played on his prologue like a child on a recorder; a sound, but not in government.
這個拼法也被記錄為下列字的變化形：
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。