bott 1
/bot/ , n.
bot.
bott 2
/bot/ , n.
Metall. a conical knob, mounted on a rod, for stopping temporarily the flow of molten metal or slag from a blast furnace or cupola.
[ 1875-80; perh. special use of dial. bot (now obs.) iron tool for marking sheep, itself special use of ME botte (var. of BAT 1 ) shepherd's crook ]