You can think of a burner as the small place where the fire actually happens — the ring, the nozzle, the spot where fuel meets air and lights. Every other use of the word grows out of that spot: one such spot on a stove top, a whole machine built around one, a laser that burns marks instead of flames, or the idea of burning a thing up so that nothing is left behind.
From the word’s history
Wiktionary records burner as burn + -er, merging with Middle English brennere (an incendiary, incinerator), and compares German Brenner and Swedish brännare. The ending -er names the thing that does the action, so the word literally points at whatever does the burning — which is why it can be a part, a whole machine, or a thing you throw away.
來源資料記載 burner 是 burn（燒）加上 -er（做這件事的東西或人），並與中古英文 brennere（縱火者、焚燒爐）合併；德文 Brenner、瑞典文 brännare 同源。-er 指「做這個動作的那個」，所以這個字從字面上就指向「負責燒的東西」——可能是一個零件，也可能是一整台機器。
Wiktionary entry for burner, supplied in this evidence packet (source_ref kaikki:3f6f69a190036ae4:717833523)
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