In chemistry, O represents the symbol "oxygen". In medicine, O is one of the human blood types. Sometimes when saying decimals, O is another word for 0. O, the fourth vowel of the modern alphabet, corresponding to the Semitic ayin, which represented a breathing and not a vowel. The Semitic form may have derived from an earlier sign representing an eye. Words Starting With O Browse 9,760 words and phrases that start with the letter O, from oaf to ozotype. o - Wiktionary, the free dictionary. Contact … Jul 29, 2020 · Learn to recognize the upper and lowercase letter O, how to write the letter O and the short and long vowel sounds that letter O makes. This series incorporates the modalities of visual,... O is used to mean zero, for example when you are telling someone a phone number, or mentioning a year such as 1908. In Middle English and later colloquial use, o or o' can be an abbreviation of on or of, and is still literary in some words (o'clock, Jack-o'-lantern, tam-o'-shanter, cat-o'-nine-tails, will-o'-the-wisp, etc.).
