The official nickname for the state of North Dakota in the United States of America.

(astronomy) The apparent orbital period of a planet as seen from Earth.

(astronomy) The sidereal day of a planet. (I.e., in the definition for "sidereal day", replace "Earth" by the given planet.)

(astronomy) The sidereal year of a planet. (I.e., in the definition for "sidereal year", replace "Earth" by the given planet.)

(astronomy) sidereal orbital period / (astronomy) sidereal rotation period

A kind of speleothem, formed as calcite crystallizes on a nucleus such as a grain of sand, in much the same way that a biological pearl forms within a mollusc.

A tropical pest of the genus Tuckerella, with elaborate ornamentations adorning the dorsal surface of their bodies.

plural of peacock mite

A state in industrial relations in which both employer and employees abstain from industrial action, such as strikes and lockouts.

A colonial marine cnidarian of the order Pennatulacea.