What speakers mean by it now
An oxcart is a wheeled load-carrier built to be pulled by one ox or by a yoke of oxen. In current English it still names that working vehicle, not a horse-drawn farm cart and not a four-wheeled wagon. Print keeps three spellings in circulation: the closed form oxcart, the hyphenated ox-cart, and the open pair ox cart. They are the same noun, not three different machines.
The thing itself is ancient. Draft cattle and simple wheeled bodies were paired long before English had a single written word for the pairing. The late appearance of the fused noun is the historical point, not a claim that ox-drawn carts began in the 1700s.
How the compound entered English
The origin of the word oxcart is an English compounding, not a loan of a ready-made foreign noun. The Oxford English Dictionary treats ox-cart as formed inside English from ox and cart. Its earliest recovered evidence is from 1737, in the South-Carolina Gazette, a weekly printed in colonial Charleston. Merriam-Webster now gives the same first-known-use year. Collins and Dictionary.com still date the record more loosely to 1740–50. That is a difference in how dictionaries round or sample the evidence, not a disagreement about the word’s make-up.
Both halves were already old by then. English had inherited ox from Old English. It had cart in Middle English from about 1200. Speakers could have joined them centuries earlier. If they did so in speech, the dictionaries that track first print have not yet shown an earlier hit. Until the fused noun is written down, English could still name the vehicle with a phrase rather than a single lexical item.
The colonial newspaper date is also a reminder that first attestation is a record of survival, not of invention. A Charleston gazette is simply where the written form has been caught. It does not prove that the compound was coined in South Carolina, only that mid-eighteenth-century English already had it on the page.
The first half: ox
Ox comes from Middle English oxe, from Old English oxa, whose plural oxan still explains why the modern plural is oxen. Behind the Old English noun sit Proto-West Germanic *ohsō and Proto-Germanic *uhsô. Germanic relatives are easy to line up: Old Norse oxi, Dutch os, German Ochse, Gothic auhsa. Outside Germanic, Welsh ych, Sanskrit ukṣán, and Avestan uxšan- point to a Proto-Indo-European noun reconstructed as *uksḗn, a male bovine or male animal.
Some scholars connect that noun with a root meaning to sprinkle, so the animal would be named as a sire. That is a reconstructed story, not a gloss preserved in Old English, and it should stay marked as a proposal.
In ordinary Modern English the sense is narrower. An ox is typically an adult castrated male of domestic cattle, kept for draft or for meat. The word can still cover bovines more loosely, but the draft sense is the one that feeds the compound. A cart pulled by a bull or a cow may look similar in the field; the English noun still leans on the working ox.
The second half: cart
Cart is the harder of the two pieces. Middle English cart, also spelled kart, is usually traced to Old Norse kartr or a close Scandinavian relative: a two-wheeled vehicle, often without springs. Native Old English already had cræt, a cart, wagon, or chariot, perhaps first a wicker body. That native word is related to Dutch krat (basket) and to English cradle. American Heritage and Wiktionary both treat modern cart as a merger of the Norse and Old English streams rather than a clean replacement of one by the other. Etymonline puts the usual source on the Scandinavian side and treats Old English cræt as the form that receded.
The uncertainty is real and limited. No serious account takes cart from Latin carrus, the Gallic wagon-word behind car and carriage. Cart is Germanic. The open question is how much of the surviving English noun is Norse overlay and how much is the older native cræt continuing under a new spelling.
By the eighteenth century, cart already meant a small open wheeled vehicle, typically for goods, drawn by an animal or pushed by a person. Putting ox in front of it specified the animal. Parallel English formations do the same job with other draft beasts or uses: carthorse, bullock cart, handcart. Dutch ossenkar is an independent compound of the same two ideas, not a parent of the English word.
What did not change, and what did
The meaning has barely moved. An oxcart in a modern travel piece is still a cart drawn by oxen. There is no important obsolete sense to recover, and no later technical meaning that displaced the farm one. What did shift is orthography. Closed, hyphenated, and open forms have all been acceptable. Wiktionary lists ox-cart as an alternative; Collins prints both oxcart and ox-cart.
That stability of sense makes the late written date more interesting, not less. Medieval England used oxen for ploughing and hauling. English already had a dense set of ox- compounds: oxbow, oxhide, oxtail, oxherd, oxteam. The vehicle noun simply joins that series late in the documentary record. Either the fused form was rare in print before the 1730s, or earlier examples have not been indexed. Dictionaries do not currently claim a medieval first date, and it would be a guess to invent one.
A useful distinction remains between cart and wagon. A cart is typically two-wheeled; a wagon is typically four. An ox-wagon and an oxcart can share the same animals and still be different vehicles. English kept both names rather than stretching oxcart to cover every ox-drawn load.
One date worth keeping
The durable fact is the documentary one. The vehicle type is prehistoric. The English noun is a transparent compound of two Germanic pieces, first recovered in 1737, with some desk dictionaries still summarizing that evidence as the 1740s. If a later search finds an earlier print hit, the formation will not change: ox plus cart, made in English, naming a cart whose engine is an ox.