Origins
The word orchid begins with a plain-spoken Greek botanist and a pair of tubers.
Theophrastus of Eresos, pupil of Aristotle and the first systematic botanist in the Western tradition, wrote his Enquiry into Plants (Περὶ φυτῶν ἱστορίας) around 300 BCE. Looking at the root system of a common Mediterranean plant, he saw two small rounded lumps sitting side by side underneath. He called the plant ὄρχις (orkhis), which was simply the ordinary Greek word for "testicle." He was not being crude; he was being precise. Greek naturalists named things after what they looked like, and the roots looked like what they looked like. Dioscorides, writing his De Materia Medica in the first century CE, kept the name and elaborated the plant's supposed properties: eaten as an aphrodisiac, useful as a fertility treatment, and — crucially for the centuries that followed — indicative of future offspring by the sex of the tuber consumed.
The name travelled unchanged into Latin as orchis and stayed that way for more than two thousand years. Pliny the Elder's Natural History (c. 77 CE) devotes an entire chapter to it. Galen prescribed it. Medieval herbalists continued to use "orchis" throughout the Carolingian, Anglo-Norman, and Tudor periods. Working from the doctrine of signatures — the idea that a plant's outward shape reveals its inner purpose — they prescribed the firm younger tuber to couples hoping for a son, and the shrivelled older tuber to those hoping for a daughter. John Gerard's Herball (1597) lists over thirty "orchis" varieties and repeats the folk prescription without much enthusiasm. Nicholas Culpeper's English Physitian (1652) is still using the Greek form.
Latin Roots
The modern form orchid arrived in 1845, when the English botanist John Lindley, author of the Genera and Species of Orchidaceous Plants (1830–40), decided that "orchis" lacked a convenient English plural. He took the Latin genitive stem orchid- (from orchidis) and treated it as the root of a new English noun, matching the suffix pattern of pyramid, cuspid, amid, and a dozen other botanical and anatomical terms. The change was announced in his journal articles and adopted by the Victorian orchidomaniacs almost at once. The older "orchis" lingered in herbals and British field guides for a generation and is still used occasionally as the genus name for the European terrestrial species, but for the enormous tropical family that was being industrially collected in the 1840s, orchid was the word from then on. Lindley's coinage is one of the very few documentable cases of a single person visibly altering the morphology of an English botanical term.
The family Orchidaceae is one of the largest in the plant kingdom — around 28,000 accepted species in 763 genera, most of them tropical epiphytes — and the nineteenth-century craze for collecting them, "orchidelirium," drove one of the great speculative bubbles of Victorian horticulture. Benedikt Roezl, Ludwig Forstermann, and other professional orchid hunters sent back tens of thousands of specimens from the New Granada cloud forests, Borneo, and New Guinea, many of which died in transit. Joseph Paxton's orchid houses at Chatsworth and the auction rooms of Stevens's in London made and broke fortunes. Orchid cultivation is still a multi-billion-pound industry, with Thailand, the Netherlands, and Taiwan leading the modern trade.
The Greek root descends from Proto-Indo-European *h₃erǵʰi-, "testicle," which also produced Avestan ərəzi, Old Irish uirgge, and Old Armenian orjikʿ. Some reconstructions also connect Latin ervum ("bitter vetch") and Sanskrit r̥ṣabha ("bull") via extended stem variants, though these are disputed. The Germanic branch lost the root entirely: Old English had beallucas and cillepsas and a handful of other native words for the anatomy, none of them related. The Proto-Germanic word for testicle was instead *haiþan-, a separate formation. This is why English, unlike Greek or Latin, has no native word that would have served and has had to reach across the classical languages for every clinical or scientific term it needs. The anatomical meaning of orkhis therefore re-entered English only through medical Greek compounds — orchitis (inflammation of the testis, 1771), cryptorchidism (undescended testis, literally "hidden orchis," 1886), orchiectomy (surgical removal, 1886), orchidometer (a clinical tool for estimating testicular volume, 1966) — a quiet reminder that the elegant flower on the windowsill shares a root with the urology ward.
Cultural Impact
Cognates across modern European languages all descend from either the Greek orkhis via Latin or directly from Lindley's 1845 coinage: French orchidée, Italian orchidea, Spanish orquídea, Portuguese orquídea, German Orchidee, Dutch orchidee, Russian орхидея (orkhideya), Polish orchidea, Czech orchidej, Swedish orkidé, Turkish orkide. All of them preserve the -id- suffix that Lindley created, even though none of these languages has the English morphological motivation for it; the new form simply spread out from the Victorian orchid literature, which was the scientific centre of the subject in the mid-nineteenth century, and settled into every national vocabulary that needed a word for the fashionable tropical flowers.
Literary uses of orchid in English are unsurprisingly Victorian and later. H. G. Wells wrote a horror story called "The Flowering of the Strange Orchid" in 1894, playing on the period's sense that orchids were vaguely menacing, exotic, and alive in unfamiliar ways. Rex Stout's detective Nero Wolfe keeps 10,000 orchids in a rooftop greenhouse through forty-six novels (1934–1975). Susan Orlean's The Orchid Thief (1998), turned into the 2002 film Adaptation, documents the modern continuation of nineteenth-century orchidelirium in the Florida swamps. The word has never lost its faint Victorian exoticism.