oct-
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oct-
1 American
oct.
2
American
abbreviation
Oct.
3
American
abbreviation
Oct
1
British
abbreviation
oct-
2
British
combining form
Usage
What does oct- mean? Oct- is a combining form used like a prefix meaning “eight.” It is used in a great many scientific and technical terms. Octo- comes from the Greek oktṓ, meaning “eight.” The Latin equivalent, which is almost identical in spelling and pronunciation, is octō. What are variants of oct-?Oct- is a variant of octa- or octo-, which loses its -a- or -o- when combined with words or word elements beginning with vowels. Want to know more? Check out our Words That Use entries for both octa- and octo-.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
It has plunged 51% from its all-time intraday high of $126,272.76, reached on Oct.
From MarketWatch • Jun. 10, 2026
The last correction kicked off on Nov. 20, 2025, about three weeks after the XLK fund closed at a record on Oct.
From MarketWatch • Jun. 10, 2026
Tamara Gayer, 56, an Israeli activist who moved to New York in the 1990s, said her relationship with Lander deepened after Oct.
From The Wall Street Journal • Jun. 8, 2026
If a recipient lives in one of these counties, they can continue to receive CalFresh benefits without meeting the new requirement until Oct.
From Los Angeles Times • Jun. 4, 2026
Crash landing in field Damask, near Ormaie, 1I Oct.
From "Code Name Verity" by Elizabeth Wein
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
