Definition of "o" []

• The 15th letter of the modern English alphabet. (noun)
• Any of the speech sounds represented by the letter o. (noun)
• The 15th in a series. (noun)
• Something shaped like the letter O. (noun)
• One of the four major blood groups in the ABO system. Individuals with this blood group have neither A nor B antigens on the surface of their red blood cells, and have both anti-A and anti-B antibodies in their blood serum. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "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."
• "$$@@$@$$@ $$@ $@$ $@$@$o$$@$$ $@$$o o$$@$ % @$@ $$@$ $ $$$ @"