diameter

As nouns the difference between diameter and spectrometer

is that diameter is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle while spectrometer is (analytical chemistry) an optical instrument for measuring the absorption of light by chemical substances; typically it will plot a graph of absorption versus wavelength or frequency, and the patterns produced are used to identify the substances present, and their internal structure.

As nouns the difference between diameter and penetrometer

is that diameter is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle while penetrometer is a mechanical device that measures the ease of penetration of an object into a semisolid.

As nouns the difference between aphelion and diameter

is that aphelion is (astronomy) the point in the elliptical orbit of a planet, comet, etc, where it is farthest from the sun while diameter is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.

As a noun diameter is

(geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.

As a noun diameter

is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a noun diameter

is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between thick and diameter

is that thick is the thickest, or most active or intense, part of something while diameter is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.

As an adjective thick

is relatively great in extent from one surface to the opposite in its smallest solid dimension.

As an adverb thick

is in a thick manner.

As a verb thick

is (archaic|transitive) to thicken.