tub-

Descriptive of a gland consisting of tubelike acini: Acinotubular glands are those that have elongated secretory parts or elements.

A hollow cylindrical or toroidal molecule made of one element, usually carbon. Nanotubes are being investigated as semiconductors and for uses in nanotechnology.

A toroid is defined as a surface generated by rotating a closed curve around an axis that is in the same plane as the curve but does not intersect it.

Existing in tube-dwelling kinds of habitats.

Concerning the uterine or fallopian tube and the abdomen: Celia was at the hospital for an examination of the tuboabdominal parts of her body to make sure that she was healthy enough to become pregnant.

A short tubular opening, as in a glass jar or at the top of a retort (glass bulb with a long neck bent downward, used for distilling or decomposing substances by heat).