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r

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The definition of t is the eighteenth letter of the English alphabet.

(noun)

An example of r is the first letter of the word "rooster."

See r in Webster's New World College Dictionary

or R

noun pl. R's, r's

the eighteenth letter of the English alphabet: from the Greek rho, a borrowing from the Phoenician
any of the speech sounds that this letter represents, as, in English, the (r) of rude
a type or impression for r or R
the eighteenth in a sequence or group
an object shaped like

adjective

of r or R
eighteenth in a sequence or group
shaped like

radius
range
rare
received
Printing recto
retired
right
rod(s)
roentgen(s)
Card Games rubber
Baseball run(s)

☆

a film rating meaning “restricted”: it indicates that persons under seventeen may be admitted to the film only when accompanied by a parent or adult guardian

Origin: L Rex
king
Origin: L Regina
queen
Rabbi
Chem. radical, esp. organic radical
Rankine
Math. ratio
Reaumur
registered (trademark): symbol, ®
Republican
Elec. resistance
right
River
Road
roentgen(s)
Chess rook
route
ruble
Baseball run(s)
rupee
Origin: L recipe
Pharmacy take: also ℞

molar gas constant

See r in American Heritage Dictionary 4

or R

noun pl. R's r's or R's also rs or Rs

The 18th letter of the modern English alphabet.
Any of the speech sounds represented by the letter r.
The 18th in a series.
Something shaped like the letter R.

abbreviation

radius
or R Electricity resistance

A trademark used for a movie rating indicating that admission will be granted only to persons of or over a certain age, usually 17, unless accompanied by a parent or guardian.