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Used as a connective to join word elements: setiform.
[Middle English, from Old French, from Latin, stem vowel of nouns and adjectives used in combination.]
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.
used between elements in a compound word: cuneiform; coniferous. Compare -o-
[from Latin, stem vowel of nouns and adjectives in combination]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. I's Is, i's is.
1. the ninth letter of the English alphabet, a vowel.
2. any spoken sound represented by this letter.
3. something shaped like an I.
4. a written or printed representation of the letter I or
pron. nom. I, poss. my mine, obj. me; pron.
1. the nominative singular pronoun used by a speaker or writer in referring to himself or herself.n.
2. (used to denote the narrator of a literary work written in the first person singular.)
3. the ego; the self.
[before 900; Middle English ik, ich, i; Old English ic, ih; c. Old High German ih, Old Norse ek, Latin ego, Greek egṓ, Skt ahám]
usage: See me.
interstate (used with a number to designate an interstate highway): I-95.
1. the ninth in order or in a series.
2. (sometimes l.c.) the Roman numeral for 1. Compare Roman numerals.
3. Chem. iodine.
4. Biochem. isoleucine.
5. Elect. current.
Physics Symbol. isotopic spin.
1. Math Symbol. the imaginary number (-1)^(1/2).
2. a unit vector on the x-axis of a coordinate system.
var. of y-.
the typical ending of the first element of compounds of Latin words, as -o- is of Greek words, but often used in English with a first element of any origin, if the second element is of Latin origin: cuneiform; Frenchify.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.