/ˈreɪnˌfɒrɪst/
[noun] A thick, dense forest found in tropical or temperate regions that receives a very large amount of rainfall throughout the year and is home to an enormous variety of plants and animals.
The word 'rainforest' was only invented in 1898 — these ancient ecosystems existed for millions of years before humans found a name for them.
The word 'rainforest' is a compound noun made from two older words that had been part of the English language for centuries before they were ever joined together. The word 'rain' comes from the Old English 'regn', which itself descended from the Proto-Germanic 'regna-', a root shared by the Dutch 'regen' and the German 'Regen'. 'Forest', meanwhile, arrived in English much later, carried across the Channel by the Norman Conquest. It came from the Old French 'forest', which derived from the Medieval Latin 'foresta' or 'forestis silva', meaning 'the outer wood' — a royal hunting ground set apart from settled land. That Latin root likely traces back further to the Latin 'foris', meaning 'outside' or 'out of doors'.
Despite both words being very old, the compound 'rainforest' is surprisingly young. The German biologist Andreas Franz Wilhelm Schimper is widely credited with coining it — or rather its German equivalent, 'Regenwald' — in his landmark 1898 scientific work on plant geography. The English translation 'rainforest' followed closely, and the word appeared in English texts around the same time, spreading through scientific literature as botanists and geographers needed a precise term for these uniquely wet, dense ecosystems.
Before 'rainforest' existed as a single word, writers and explorers had to describe these places with longer, clumsier phrases — 'tropical jungle', 'dense tropical woodland', or simply 'the jungle'. The word 'jungle' itself, borrowed from the Hindi 'jangal' and Sanskrit 'jangala', meaning rough or arid land, was actually a poor fit for these lush, dripping environments, but it was the closest available term for a long time. The arrival of 'rainforest' gave the language something precise: a word built from its own description, telling you exactly what kind of forest it is in the moment you hear it.
What is remarkable about 'rainforest' is how quickly it moved from scientific vocabulary into everyday speech. Through most of the early 20th century, it remained largely confined to academic and geographic writing. It was the environmental movement of the 1970s and 1980s, and the global alarm raised about deforestation in the Amazon basin, that pushed the word into living rooms and newspaper front pages. Suddenly, everyone needed to talk about rainforests, and the word was ready and waiting — simple, vivid, and perfectly self-explanatory.
Today, 'rainforest' carries enormous cultural and emotional weight far beyond its literal meaning. It has come to represent biodiversity, ecological fragility, and the tension between human development and the natural world. The word also split into two recognised types: the 'tropical rainforest', found near the equator in places like Brazil, the Congo, and Borneo, and the 'temperate rainforest', found in cooler coastal regions such as the Pacific Northwest of North America and the south of Chile. Both rely on that same core idea locked inside the word: a place where rain defines everything.