(quantum mechanics, chemistry) A mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus.

(idiomatic) Initially; at the start.

(not comparable) Having to do with athletes. / Physically active. / Having a muscular, well developed body, being in shape. / An attribute of a motion or play which requires fine physical ability.

A muscular, large–boned person, in the typology of Ernst Kretschmer.

a type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform. Atolls have a unique geology, so not all islands with a reef and a lagoon are atolls

(pathology) The clogging or hardening of arteries or blood vessels caused by plaques (accumulations of fatty deposits, usually cholesterol).

From side to side, often in an oblique manner; across or over. / Across the path of something, so as to impede progress.

From one side to the other side of; across. / Across the course or path of, so as to meet; hence (figuratively), to the attention of. / Across the course or path of, so as to oppose. / Across; through.

An instrument for reducing a liquid to spray or vapor for disinfecting, cooling, medical use or perfume spraying.

The reappearance of an ancestral characteristic in an organism after several generations of absence; a throwback.