ortho (countable and uncountable, plural orthos)
(countable, chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.
(countable, astronomy) A certain type of flat eyepiece.
(countable, photography, dated) An orthochromatic plate.
(countable, imaging) An orthophoto.
(uncountable, medicine) Orthopedics.
• thoro
Source: Wiktionary
Or"tho-. Etym: [Gr. upright, vrdh to grow, to cause to grow.]
1. A combining form signifying straight, right, upright, correct, regular; as, orthodromy, orthodiagonal, orthodox, orthographic.
2. (Chem.)
Definition: A combining form (also used adjectively), designating: (a) (Inorganic Chem.) The one of several acids of the same element (as the phosphoric acids), which actually occurs with the greatest number of hydroxyl groups; as, orthophosphoric acid. Cf. Normal. (b) (Organic Chem.)
Definition: Connection with, or affinity to, one variety of isomerism, characteristic of the benzene compounds; -- contrasted with meta- or para-; as, the ortho position; hence, designating any substance showing such isomerism; as, an ortho compound.
Note: In the graphic representation of the benzene nucleus (see Benzene nucleus, under Benzene), provisionally adopted, any substance exhibiting double substitution in adjacent and contiguous carbon atoms, as 1 & 2, 3 & 4, 4 & 5, etc., is designated by ortho-; as, orthoxylene; any substance exhibiting substitution of two carbon atoms with one intervening, as 1 & 3, 2 & 4, 3 & 5, 4 & 6, etc., by meta-; as, resorcin or metaxylene; any substance exhibiting substitution in opposite parts, as 1 & 4, 2 & 5, 3 & 6, by para-; as, hydroquinone or paraxylene.
Source: Webster’s Unabridged Dictionary 1913 Edition
5 May 2025
(adjective) not developed, improved, exploited or used; “vast unexploited (or undeveloped) natural resources”; “taxes on undeveloped lots are low”
The first coffee-house in Mecca dates back to the 1510s. The beverage was in Turkey by the 1530s. It appeared in Europe circa 1515-1519 and was introduced to England by 1650. By 1675 the country had more than 3,000 coffee houses, and coffee had replaced beer as a breakfast drink.
