(physics) The collective states of all electrons in an atom having the same principal quantum number (visualized as an orbit in which the electrons move).

beta sheet

(biochemistry) A secondary structure in proteins consisting of multiple strands connected laterally

(obsolete) A sheepdog that worries (chases or attacks) sheep. / (obsolete, figuratively, derogatory) A contemptible person, expecially one who practices petty thefts.

Any of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped.

plural of turnip shell

plural of turban shell

A marine gastropod of the family Turbinidae, or the shell thereof.

(dated) bashful; sheepish

plural of bubble shell