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Related to sesqui-: Hepta
One and a half: sesquicentennial.
[Latin sēsqui- : sēmis, a half; see sēmi- in Indo-European roots + -que, and; see kwe in Indo-European roots.]
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.
1. indicating one and a half: sesquicentennial.
2. (Chemistry) (in a chemical compound) indicating a ratio of two to three: sesquioxide.
[from Latin, contraction of semi- + as as2 + -que and]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a combining form meaning “one and a half”: sesquicentennial.
[< Latin sēsqui- <*sēm(i)sque=sēmis half-unit, a copper coin worth half an as (appar. sēm(i)- semi- + as as2) + -que and]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.