What is Lapsus Calami?

Mary McMahon
Mary McMahon

The phrase “lapsus calami” is Latin for “a slip of the pen.” Basically, it's the written equivalent of a slip of the tongue, an error which can be humorous, unintentionally revealing, or awkward, depending on the circumstances and the slip. A lapsus calami may take the form of a spelling or grammar error, a spoonerism, in which letters are switched around, or the replacement of an entire word or phrase. Even in the era of the spell checker, slips of the pen (or keyboard) can still occur, because spellcheckers will not pick up word substitutions, doubled words, or homonyms.

Written material containing any type of error may be considered lapsus calami.
Written material containing any type of error may be considered lapsus calami.

This term has its origins in zoology and taxonomy, where people often misspell scientific names, especially when they have not studied Latin. Although Latin was once the language of choice for educated individuals, making the use of Latin for scientific names very sensible, this language is much less widely studied today. This can make researchers prone to errors when they try to recall the spelling of a scientific name.

A lapsus calami may take the form of a Freudian slip.
A lapsus calami may take the form of a Freudian slip.

Zoologists actually have a specific name for a lapsus calami involving a scientific name; it's known as a nomen nullum, a “null name.” The spelling of scientific names can be further complicated by disputes over the scientific name of an organism, especially when a scientific name is derived from the name of the person who discovered the organism, or the location where it was discovered.

Sometimes, a lapsus calami takes the form of a Freudian slip, in which thoughts from the subconscious mind rise to the surface and express themselves on paper. In these situations, the resulting error can sometimes by humiliating for the person who makes it, especially if he or she has been obsessing about a specific person or action and this obsession worms its way into a written communication.

We all make slips of the pen now and then, especially when we are working quickly, or when we are distracted, splitting our focus from our work. While such errors cannot always be avoided, they are a reminder that it is a very good idea to read written material over carefully before handing it off to someone else. Sometimes a quick review will pick up a glaring mistake. If the document is especially important, you might want to ask a friend to glance at it as well, because sometimes we gloss over a lapsus calami or two when reviewing written work.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a wiseGEEK researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

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Discussion Comments


My first lapsus calami was so embarrassing that I don't think I'll ever be careless enough to make another. In 10th grade, our English Literature class had to write essays about Romeo and Juliet and our own ideas about the play. We had to read these essays aloud. I had a huge crush on the teacher, but I had told no one.

Mine started out okay. I had written the name 'Romeo' several times as it should have appeared. Then, at about the middle of the essay, probably right around the time my mind had started to wander while writing, I had substituted the teacher's name for 'Romeo.' The class got a huge laugh at my expense, and I think the red stayed on my face for the remainder of the semester.


It's amazing that the human brain can not only make a lapsus calami but can also skip over it when proofreading! I have learned the hard way not to daydream or listen to music while typing important documents.

My beach vacation was only one week away, and I was working on my resume. I had reggae music on in the background because it reflected my mood and enhanced my happiness. I had gotten so into my vacation daydream that when I listed my former places of employment, I accidentally typed in the name of the hotel I would be staying at in Jamaica! It's funny that I listed the job of housekeeping correctly, because I had worked for a hotel in my hometown as a housekeeper, but I didn't notice my lapsus calami until I got asked about my time in Jamaica during a job interview!

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