Which herb takes its name from the Greek for 'joy of the mountain'?

Oregano ('Origanum vulgare') is a species of flowering plant in the mint family 'Lamiaceae'. It was native to the Mediterranean region, but widely naturalised elsewhere in the temperate Northern Hemisphere.

Used since the middle 18th century, the Spanish word 'orégano' is derived from the Latin 'orīganum' which itself comes from Classical Greek 'ὀρίγανον' ('orī́ganon'). The ultimate origin is disputed; some claim it is a compound Greek term that consists of 'ὄρος' (óros) meaning 'mountain', and 'γάνος' (gános) meaning 'joy', thus, 'joy of the mountain' while The Oxford English Dictionary states it is 'probably a loanword as the plant comes from Africa', and that 'joy of the mountain' is a backronym.

Oregano is a woody perennial plant, growing 20–80 cm (8–31 in) tall, with opposite leaves 1–4 cm (1⁄2–1+1⁄2 in) long. The flowers which can be white, pink or light purple, are 3–4 mm (1⁄8–3⁄16 in) long, and produced in erect spikes in summer. It is sometimes called wild marjoram, and its close relative, 'O. majorana', is known as sweet marjoram. Both are widely used as culinary herbs, especially in Turkish, Greek, Spanish, Italian, Hispanic, and French cuisine. Oregano is also an ornamental plant, with numerous cultivars bred for varying leaf colour, flower colour and habit.