A website is a presence on the World Wide Web. As of 2017, there are more than one billion. To qualify as a bona fide site, it must be available over the Internet around the clock.
Tube means a hollow cylinder. An example of a tube is manicotti pasta. The definition of a tube is a pliable container with a screw cap at one end to keep it closed. An example of tube is the container that toothpaste comes in.
tubercle. n. 1. (Botany) any small rounded nodule or elevation, esp on the skin, on a bone, or on a plant. 2. (Pathology) any small rounded pathological lesion of the tissues, esp one characteristic of tuberculosis. [C16: from Latin tÅ«berculum a little swelling, diminutive of tuber].