The center of the largest circle that can be drawn inside a polygon tangent to its edges; or the intersection of a triangle's angle bisectors

The center of the smallest circle that can be drawn around a polygon intersecting only its vertices; or the intersection of a triangle's perpendicular bisectors

The intersection of the three altitudes of a triangle

The unweighted average position of a geometric figure, or intersection of a triangle's medians

Ultimate destination of water that falls in an endorheic basin

Point on the surface of Earth directly above an earthquake's focus

The average position of all of the mass in a physical system, i.e. its center of mass.

An earthquake's focus, under the ground

Organelles that move to the poles of a cell during mitosis

The point of attachment of two sister chromatids during mitosis

____ force is an outward-directed inertial force experienced in the local reference frame of a rotating system

____ force is an inward-directed force that creates the acceleration necessary for rotation

Measure of deviation from circularity, e.g. of an ellipse; or a characteristic of a wealthy weirdo

A measure of the proportion of a solute in a solution; e.g. molarity

The middle portion of a vertebra, homonymous with a popular brand of vitamins

The idea, propounded by Copernicus, that Earth orbits the Sun

Temporary organ in most mammals that allows fetal gas exchange, food intake, and waste disposal

Predatory myriapod in class Chilopoda, often equipped with venomous claws

Exhibiting luminous colors that change from different angles, like a thin layer of oil

Permitting light to pass through, but not transmitting clear images

Emitting electromagnetic radiation as a result of being heated

Emitting light after absorbing a different frequency of electromagnetic radiation

Emitting light without having to be heated or irradiated

Number of data points per hundred that fall below a given value

The complement of a gibbous in the lunar cycle

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