Tubercle

In anatomy, a tubercle (literally 'small tuber', Latin for 'lump') is any round nodule, small eminence, or warty outgrowth found on external or internal organs of a plant or an animal.

A tubercle is generally a wart-like projection, but it has slightly different meaning depending on which family of plants or animals it is used to refer to.

In the case of certain orchids and cacti, it denotes a round nodule, small eminence, or warty outgrowth found on the lip.

The affected parts develop lesions in the form of small nodules called tubercles, from which the disease gets its name.

Around the sixth week of gestation, six swellings of tissue, called the hillocks of His,[a] arise around the area that will form the ear canal.

[7] The genital tubercle is a small bump that eventually develops into a penis or a clitoris on a human fetus.

This view of the cactus Mammillaria marksiana shows its pattern of prominent tubercles, with the spines emanating from each tubercle's tip.
Nudibranch Phyllidia varicosa , clearly showing the yellow tubercles on the dorsum
Skin impression from the abdomen of the duck-billed dinosaur Edmontosaurus annectens , showing tubercular scales