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circum-(word root) around
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
Around; about: circumlunar.
[Latin, from circum, around, accusative of circus, circle; see circle.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
around; surrounding; on all sides: circumlocution; circumrotate.
[from Latin circum around, from circus circle]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a prefix with the meaning “round about, around,” found in Latin loanwords, esp. derivatives of verbs that had the general sense “to encompass or surround” (circumference; circumstance) or “to go around” in the manner specified by the verb (circumnavigate; circumscribe); on this basis forming adjectives in English with the meaning “surrounding” that named by the stem (circumpolar).
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A prefix meaning "around", as in circumscribe, to draw a figure around another figure.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
pref → um-, um … herum
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007