diameter

As nouns the difference between diameter and phytoplasma

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 phytoplasma is any of various specialized bacteria that are obligate parasites of plant phloem tissue and of some insects, characterized by the lack of a cell wall, a pleiomorphic or filamentous shape (normally with a diameter of less than one micrometer), and their very small genomes.

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 proper noun theaetetus is

a classical greek mathematician credited with proving that there are precisely five.

As nouns the difference between diameter and vasomotion

is that diameter is any straight line between two points on the circumference of a circle that passes through the centre/center of the circle while vasomotion is a change in the diameter (caliber) of a blood vessel.

As nouns the difference between diameter and pupillometer

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 pupillometer is a device used to measure the diameter of the pupil of the eye.

As nouns the difference between diameter and arteriogenesis

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 arteriogenesis is (medicine) an increase in the diameter of existing arterial vessels.