R (Noun)
Meaning 1
The length of a line segment between the center and circumference of a circle or sphere.
Classification
Nouns denoting attributes of people and objects.
Synonyms
Hypernyms
Hyponyms
Meaning 2
A unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air.
Classification
Nouns denoting quantities and units of measure.
Synonyms
Hypernyms
Meaning 3
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole.
Classification
Nouns denoting quantities and units of measure.
Synonyms
Hypernyms
Meaning 4
The 18th letter of the Roman alphabet.
Classification
Nouns denoting communicative processes and contents.
Examples
- She pointed to the letter on the chart and said the letter R comes after Q.
- The students practiced writing the letter R by hand in their notebooks.
- In the phonetic alphabet, the letter R is represented by the word Romeo.
- He struggled to sound out the word because it started with the letter R.
- The teacher wrote the letter R on the blackboard and asked the class to recite it.