One shelf on a ladder of sound: the middle-low level, under the tenor and over the bass. Whatever stands on that shelf can be called a baritone — a man's voice, the line of music written for it, or an instrument that plays there.
baritone 可以想成音高階梯上的「中間偏低那一層」：上面是 tenor，下面是 bass。只要站在這一層，就可以叫 baritone。站上去的可以是一個人的嗓音，可以是樂譜上寫給這一層的那條旋律線，也可以是吹這個音域的樂器。所以這個字與其說是一種聲音，不如說是一個位置。
From the word’s history
From Italian baritono, from Ancient Greek barús (heavy) plus tónos (tone) — literally a heavy tone. The old parts still point at the shelf: heavier and lower than a tenor, but not as far down as a bass.
來自義大利文 baritono，再往前是希臘文 barús（重的）加 tónos（音），字面就是「重的音」。這兩個字根正好指出它的位置：比 tenor 沉，但還沒沉到 bass 那一層。
Wiktionary, "baritone"
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