The word "asphalt" is familiar to anyone who has driven down a road or had a driveway paved, but its roots go back to ancient Greek, and people still pronounce it several different ways. In American English the usual pronunciation is AS-fawlt. Here is where the word came from, how its meaning changed, and why you hear it said differently around the world.
Ancient Origins of the Word "Asphalt"
English got the word by way of Latin from the Greek ἄσφαλτος (ásphaltos), the name for natural bitumen. Merriam-Webster traces it from Middle English aspalt, from Late Latin aspaltus, from Greek asphaltos. A common explanation links the Greek word to a- ("not") and sphallein ("to cause to fall"), giving a sense of "secure" or "not slipping," which fits a material used to bind and seal things. Etymologists treat that explanation with some caution, and the word may have been borrowed into Greek from an older language.
The material itself was in use long before the Greeks named it. Natural bitumen was used across ancient Mesopotamia and the Near East for thousands of years to waterproof boats and baskets and to set bricks, and it was used in some ancient Egyptian embalming.
The Evolution of Its Meaning
For most of history, "asphalt" meant natural deposits: bitumen seeping from the ground or floating on lakes. The famous La Brea "Tar" Pits in Los Angeles are actually natural asphalt seeps. In the 19th century the meaning broadened to include asphalt refined from crude oil. Engineers found that mixing asphalt binder with crushed stone and sand produced a strong, flexible pavement, which we now call asphalt concrete, and it became the backbone of modern road building. Our article on what asphalt is and how it is made explains the modern material.
Regional Differences in Pronunciation
Pronunciation varies across the English-speaking world:
- United States: usually AS-fawlt, with an "s" sound, not "sh."
- United Kingdom: usually AS-falt or AS-fawlt.
- Australia and New Zealand: commonly ASH-felt or ASH-falt.
- Canada and parts of the U.S.: some speakers also say ASH-falt.
Dictionaries such as Merriam-Webster list the "ash" pronunciation as a recognized variant, so none of these are wrong; they reflect how the "s" before "ph" shifts in natural speech.
Misconceptions and Clarifications
Asphalt is often called "tar," but the two are different materials: asphalt binder comes from petroleum, while traditional tar comes from coal. That difference matters for sealers. Coal-tar sealcoats were once common, but Connecticut law (CGS § 13a-98o) has banned coal-tar sealants on state and local highways since 2017, and asphalt-emulsion sealers are the common alternative for driveway sealcoating.
In the U.S., "blacktop" is a casual name for asphalt pavement, the same material used for a typical new asphalt driveway. In the UK, "asphalt" can also mean mastic asphalt, a dense waterproof surfacing that differs from the asphalt concrete common on American roads and driveways. Our asphalt glossary defines more of these terms.
Historical Name Variations of Asphalt
- Ancient Greek: ἄσφαλτος (ásphaltos), the word for natural bitumen, found in classical writers.
- Latin: asphaltus and the later form aspaltus, used for bitumen in Roman and medieval texts.
- Middle English: aspalt, borrowed from Late Latin.
- Modern English: "asphalt," respelled to match the Greek, now used worldwide.
Fun Facts About the Name "Asphalt"
The Dead Sea was known to the Romans as Lacus Asphaltites, the "Lake of Asphalt," because lumps of bitumen floated to its surface. The La Brea seeps, despite the "tar" in their name, are asphalt, and they have preserved Ice Age animal fossils for tens of thousands of years. Asphalt is also one of the most reused construction materials today; our article on recycling asphalt explains how old pavement becomes new.
Final Thoughts
From the Greek ásphaltos to today's engineered pavements, the word "asphalt" has always described something that holds things together. However you say it, AS-fawlt, ASH-falt, or somewhere in between, the history behind the name matches the durability of the material.
Glossary term: Binder is the asphalt component that holds the stone and sand together to form asphalt concrete.
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