Etymology
1. From Middle English stool, from Old English stōl (“chair, seat”), from Proto-West Germanic *stōl, from Proto-Germanic *stōlaz (“chair”), from Proto-Indo-European *stoh₂los (“frame, rack, stand”), from *steh₂- (“to stand”).
2. Cognates
3. Cognate with North Frisian stuul, stölj, Stööl (“chear”), Saterland Frisian Stoul (“chear”), West Frisian stoel (“chair, seat”), Dutch stoel (“chair”), German Stuhl (“chair”), Low German Stohl (“chair”), Luxembourgish Stull (“chair”), Vilamovian śtül (“chair”), Yiddish שתוהל (shsuhl), שטול (shtul, “chair”), Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish stol (“chair”), Faroese stólur (“chair”), Icelandic stóll (“chair”), Crimean Gothic stul (“seat”), Gothic 𐍃𐍄𐍉𐌻𐍃 (stōls, “chair; throne”), Russian стул (stul, “chair”), Estonian tool (“chair”), Finnish tuoli (“chair”); also Breton and Cornish sevel (“to erect, rise; to build; to lift; to compose; to earn”), Irish sáil, sál (“heel”), Scottish Gaelic sàil (“heel”), Welsh sefyll (“to stand; to stop; to sit”), Latin sistō (“to set; to stop; to stand; to stabilise”), Umbrian 𐌔𐌄𐌔𐌕𐌖 (sestu, “to place”), Greek στέκω (stéko), στέκομαι (stékomai, “to stand up”), Albanian shtoj (“to add; to augment; to accumulate”), Lithuanian stálas (“table”), Old Prussian stallan (“table”), Belarusian, Bulgarian, Macedonian, and Russian стол (stol, “table”), Czech stůl (“table”), Polish stół (“table”), Serbo-Croatian сто̑, сто̑л, stȏ, stȏl (“table”), Slovak stôl (“table”), Slovene stol (“chair”), Armenian երթալ (ertʻal), էթալ (ētʻal, “to go”), Central Kurdish ستوون (stûn, “column”), Pashto ستن (stən, “needle; awl; pin; syringe; post; hand; dragonfly”), Persian ایستادن (ēstādan / istâdan), وایسادن (vâysâdan), وایستادن (vâystâdan, “to stand up; to step; to stay”), ستون (sotun / sutūn, “column”), Northern Kurdish rawestîn (“to stand up”), stûn (“column”), Ossetian стын (styn, “to stand up”), Hittite 𒋾𒄑𒍣 (tiezzi, “to step; to place oneself”), Tocharian A ṣtäm- (“to stand”), Tocharian B stäm- (“to stand”), Sanskrit तिष्ठति (tiṣṭhati, “to stand; to stay”). More at stand.
4. The medical use derives from sense 2 (seat used for defecation). See: Scots Gaelic '
sàil', Welsh '
sefyll', Latin '
sistō', Greek '
στέκω', Albanian '
shtoj', Armenian '
երթալ', Dari '
ایستادن', Sanskrit '
तिष्ठति'.