rho

[ roh ]

/ roʊ /

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noun, plural rhos.

the 17th letter of the Greek alphabet (P, ρ).

the consonant sound represented by this letter.

QUIZ

SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?

Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!

Question 1 of 6

Which form is used to state an obligation or duty someone has?

shall

should

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Origin of rho

1350–1400; Middle English <Greek rhô

Words nearby rho

rhizopus, rhizosphere, rhizotomy, Rh negative, Rh null syndrome, rho, rhod-, Rhoda, rhodamine, Rhode Island, Rhode Island bent

Other definitions for rho (2 of 2)

Rho.

or Rhod

abbreviation

Rhodesia.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use rho in a sentence

Pions don’t possess spin, but rho mesons do, so they must contribute to the overall spin of the proton in a way Alberg and Miller hope to determine.
Decades-Long Quest Reveals Details of the Proton’s Inner Antimatter|Natalie Wolchover|February 24, 2021|Quanta Magazine
RHO now has a roster of international clients and fifty employees.
A Woman Blogger’s Scoop Helped Save Tunisia From Islamists|Thomas A. Bass|April 6, 2014|DAILY BEAST
Peace was agreed upon, and Demetrius retreated, giving up to the Rho´di-ans all the mighty war engines he had brought with him.
The Story of the Greeks|H. A. Guerber
The original Greek included a variant form of "rho" which could not be duplicated.
Blackwood's Edinburgh Magazine, Volume 56, Number 350, December 1844|Various

For example, what business has the letter rho in the word katoptron, or the letter sigma in the word sphigx?
Cratylus|Plato
We can understand one another, although the letter rho accent is not equivalent to the letter s: why is this?
Cratylus|Plato
I think that Donaldson and Mone are unquestionably wrong in making the name of this river Rho-dan-us, from a word dan, water.
The River-Names of Europe|Robert Ferguson

British Dictionary definitions for rho

rho

/ (rəʊ) /

noun plural rhos

the 17th letter in the Greek alphabet (Ρ, ρ), a consonant transliterated as r or rh

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for rho (1 of 2)

The Greek letter rho. Entries beginning with this character are alphabetized under rho.

Medical definitions for rho (2 of 2)

rho

The 17th letter of the Greek alphabet.