oct-
Jump To:
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
There’s also around $1 billion in Iranian revenues in Oman, which was also informally blocked after the Oct.
From The Wall Street Journal • Jun. 6, 2026
Lululemon also agreed to bring aboard another director with expertise in apparel by Oct.
From MarketWatch • Jun. 4, 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
From the notes of Dr. Julian Nye, MD, PsyD: Thurs, Oct 21, third session with Nicole Castro, begun at 8:30pm, at Castro residence.
From "Burning Blue" by Paul Griffin
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.
