(noun) The 15thletter of the modernEnglishalphabet.
(noun)Any of the speechsoundsrepresented by the lettero.
(noun) The 15thin a series.
(noun)Somethingshapedlike the letterO.
(noun)One of the fourmajorbloodgroupsin the ABOsystem.Individuals with this bloodgrouphave neither A nor Bantigenson the surface of their redbloodcells, and haveboth anti-A and anti-B antibodiesin their bloodserum.
(noun) the 15th letter and fourth vowel of the modern English alphabet
(noun) any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form
Use "o" in a sentence
"Without referring to geometry we can see at a glance by Fig. 172, where we have simply turned the square _o o o o_ on its centre so that its angles touch the sides of the outer square, that it is exactly half of square _ABEF_, since each quarter of it, such as"
"By drawing _ff_, _f·f_ passing through the diagonals we get the four points _o o o o_ through which to draw the smaller square."