A Latin name still used in English
In ordinary English the desert animal with one or two fatty humps is a camel. Camelus is the learned form of the same name. Zoologists write it as the genus Camelus, established by Linnaeus in 1758, and English scientific prose uses that Latin nominative for the true camels as a group. The living species under it are the one-humped dromedary, the two-humped domestic Bactrian camel, and the wild Bactrian camel of the Gobi. A binomial such as Camelus dromedarius is not a fresh English coinage; it is the old Latin noun kept as a taxonomic label.
The Latin word is a second-declension masculine: camēlus, genitive camēlī. Classical authors used it for the animal itself, whether the beast had one hump or two. A feminine camēla is also recorded, and Pliny sometimes treats camelus as feminine. A later spelling camellus was reanalyzed as if it were a diminutive. That spelling, rather than the classical nominative, stands behind Italian cammello and several related Romance forms. None of this is folk morphology in English: the -us is simply the Latin ending that Greek -os regularly became when the noun was borrowed.
How the form reached English
Latin did not invent the name. It took camēlus from Greek κάμηλος, which is already attested in the early fifth century BCE in Aeschylus and Herodotus. Roman writers treat the loan as ordinary Latin. Varro discusses it in his work on the Latin language; Cicero mentions the animal in a passage on nature; Livy, Horace, and Tacitus all use the noun. The late Roman price edict of Diocletian even distinguishes a two-humped camelus from the dromedarius, so the generic Latin word and a more specific riding name could stand side by side.
Medieval Latin kept camelus as a glossary lemma. English school lists still pair the Latin citation form with a vernacular gloss: one nominale from around 1500 explains hic camelus as schamelle. The origin of the word camelus in English is therefore not a single borrowing event. Everyday camel arrived early; the Latin nominative itself stayed visible in learned and scientific English.
Old English already had camel, taken from Latin, but the borrowing is thin. It appears mainly in the Lindisfarne and Rushworth gospel glosses, in the north, where the Latin gospel word was rendered camel or camella instead of the native term. That native word was olfend, from a Germanic name that also shows up as Gothic ulbandus, Old High German olbenta, and Old Norse ulfaldi. Speakers who had never seen either animal mixed camel and elephant in the same word. After the Norman Conquest, Anglo-French camel and cameil, from Latin camēlus, with Central French chamel beside them, fed Middle English camel, camaille, chamoil, and many other spellings. Standard dictionaries date the common English noun before the twelfth century.
The Latin nominative returned as a scientific English word in 1758, when Linnaeus set up the genus Camelus in the tenth edition of Systema Naturae. From then on, camelus in English is chiefly a taxonomic name, while camel remains the ordinary noun. Historically they are the same word at different stages of borrowing.
Greek, Semitic, and an awkward first consonant
Greek κάμηλος is itself a loan. The usual account traces it to a West Semitic noun reconstructed as *gamal-, sometimes treated as Common Semitic, meaning the animal rather than a phrase built from smaller English-style parts. Hebrew gāmāl, Aramaic gamlā, Sabaean gml, and Arabic jamal belong to that family. Coptic čamoul shows the same Wanderwort farther along the Nile. Because the camel is not native to Europe, a borrowed name is what the history of the animal would lead one to expect.
The match is close but not tidy. Semitic has an initial g-; Greek has k-. Greek already possessed a g, so the substitution is not a routine adjustment to Greek sound patterns. Phoenician looks like a convenient historical source, yet Phoenician turned long ā into ō, which should have given a Greek form with ō in the second syllable, not the ē that is actually found. The place-name Gaugamela, explained in antiquity as camel house, keeps a g, but that is a foreign name, not the Greek common noun. An Anatolian, possibly Luwian, intermediary has been proposed, because Anatolian languages typically lack word-initial voiced stops; the Luwian form offered as evidence is itself uncertain. A comparison with East Caucasian words for the camel exists in recent scholarship, but it is a minority hypothesis, not the handbook etymology. Greek and Semitic names for the camel are related. The exact last hop into Greek is still argued.
Some older accounts also tie the Semitic noun to an Arabic verb meaning to bear. The reconstruction that dictionaries now print is a noun for the animal, not a transparent verb-plus-suffix story.
Stable sense, extra uses, and descendants
Sense has barely shifted. Camelus names the beast of burden. Ancient writers used it for both the Arabian and the Bactrian types; later zoology split those into species under one genus. The word did pick up one striking extra job in naming. Greeks called the ostrich strouthokamēlos, a camel-sparrow, after the long neck and running gait. Latin struthiocamelus carried the compound, and Linnaeus’s Struthio camelus still does. The same Latin noun that labels the camel genus also sits inside the scientific name of the ostrich.
Romance and other European languages inherited or reborrowed the Latin form: French chameau, Spanish camello, Portuguese camelo, Italian cammello, German Kamel, Dutch kameel, Irish camall. English camel is the vernacular descendant. Camelus is the citation form that taxonomy froze in the eighteenth century.
The durable detail is small. Everyday English dropped the Latin ending; scientific English put it back, and with it the whole trail from a Semitic animal name through Greek κάμηλος into Latin camēlus.