Coronaviruses get their name from the Latin word “corona,” meaning crown. When scientists first saw these viruses under an electron microscope in the 1960s, they noticed club-shaped spikes studding the surface of each viral particle, radiating outward like the points of a crown. That distinctive appearance stuck, and the name has been used for the entire family of viruses ever since.
What Scientists Saw Under the Microscope
In 1966, a Scottish virologist named June Almeida received a mysterious virus sample labeled B814 from collaborators studying common colds. Using a specialized electron microscopy technique she had pioneered, Almeida was able to visualize the virus for the first time. What she saw were halo-like structures surrounding each viral particle, resembling a solar corona, the glowing ring of light visible around the sun during a total eclipse.
That visual resemblance is more than casual. Coronavirus particles are roughly spherical, wrapped in an outer layer of fatty membrane. Protruding from that membrane are glycoproteins, sugar-coated protein molecules that form club-shaped spikes across the entire surface. Under magnification, these spikes fan outward in every direction, creating what looks like a radiant crown or sunburst pattern. The comparison wasn’t just to any crown but specifically to the “radiate” style of crown, the kind with spokes or rays extending from a central band, mimicking the power of the sun. Ancient rulers wore that style deliberately, and the visual parallel was unmistakable to the researchers naming the virus.
How “Corona” Became Official
The word “corona” entered English in the 1500s, borrowed directly from Latin. It carried both the literal meaning of crown and the astronomical meaning, referring to the outermost layer of the sun’s atmosphere, which appears as a glowing white halo during an eclipse. When virologists chose the name “coronavirus,” they were drawing on both associations: the crown-like shape and the solar corona’s ring of light.
The International Committee on Taxonomy of Viruses, the body responsible for officially classifying and naming viruses, formally recognized the family Coronaviridae in 1975. By that point, multiple coronaviruses had been identified, most of them associated with mild respiratory illness. The family name locked in the crown metaphor for good, covering every virus in the group regardless of how severe or mild the disease it caused.
Why There Are So Many Coronavirus Names
“Coronavirus” refers to the entire family. Individual viruses within that family get their own names based on their genetic structure, which helps researchers develop diagnostic tests, vaccines, and treatments. This is why the virus behind the 2003 SARS outbreak has a specific name (SARS-CoV), and the virus responsible for the COVID-19 pandemic has another (SARS-CoV-2). The “CoV” in both names is shorthand for “coronavirus,” placing them within the same family tree.
SARS-CoV-2 was named on February 11, 2020, by the International Committee on Taxonomy of Viruses, because genetic analysis showed it was closely related to the original SARS coronavirus. On the same day, the World Health Organization gave the disease it causes a separate name: COVID-19, short for “coronavirus disease 2019.” This two-name system exists because viruses and diseases are named by different organizations for different purposes. Viruses are classified by genetic relationships. Diseases are named to help public health officials communicate about prevention, spread, and treatment.
The WHO also had a practical concern. Because the virus’s official name contained “SARS,” there was worry that using it publicly could trigger unnecessary fear, particularly in parts of Asia that were hit hardest by the 2003 SARS outbreak. For public communications, the WHO began referring to it simply as “the COVID-19 virus” rather than SARS-CoV-2.
The Spike That Gives the Crown Its Shape
The specific structure responsible for the crown appearance is the spike glycoprotein, often called the S protein. Each coronavirus particle is covered in these spike proteins, which protrude from the surface of the mature virus. They aren’t just decorative. The spike protein is the tool the virus uses to latch onto and enter human cells, which is why it became the primary target for COVID-19 vaccines. The vaccines teach your immune system to recognize the spike protein so it can neutralize the virus before infection takes hold.
It’s a fitting irony that the feature giving coronaviruses their regal name is also their most critical vulnerability. The crown-like spikes that inspired a generation of virologists in the 1960s turned out to be the key to fighting the deadliest pandemic coronavirus sixty years later.