A small flexible cylindrical container sealed at one end and having a screw cap at the other, for pigments, toothpaste, or other pastelike substances, Botany The lower, cylindrical part of a gamopetalous corolla or a gamosepalous calyx, The elongated space inside a wave when it is breaking, The elongated space inside a wave when it is breaking, An underground railroad system, especially the one in London, England, A vessel in animal bodies or plants, which conveys a fluid or other substance