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iso-

a combining form meaning “equal,” used in the formation of compound words: isochromatic; in chemistry, used in the names of substances which are isomeric with the substance denoted by the base word: isocyanic acid.

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Also, especially before a vowel, is-.

Origin:
< Greek, combining form of ísos equal

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Iso- is always a great word to know.

So is ort. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a scrap or morsel of food left at a meal.

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Collins

World English Dictionary

iso- or (before a vowel) is-

—*combining form*
1.	equal or identical: isomagnetic
2.	indicating that a chemical compound is an isomer of a specified compound: isobutane; isocyanic acid

[from Greek isos equal]

is- or (before a vowel) is-

—*combining form*

[from Greek isos equal]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

iso- or is-
pref.

Equal; uniform: isobar.
Isomeric: isopropyl.
Characterized by sameness with respect to species: isoantigen.
Characterized by sameness with respect to genotype: isograft.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage

Science Dictionary

iso-

A prefix that means "equal," as in isometric, "having equal measurements."
A prefix used to indicate an isomer of an organic compound, especially a branched isomer of a compound that normally consists of a straight chain. The isomer is characterized by a Y-shaped branch at the end of the chain that consists of two "prongs". Each prong consists of one carbon atom. Thus isopentane contains five carbon atoms like normal pentane, but arranged as a chain of three carbons plus a Y-shaped branch of two carbons at the end.

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isobathytherm isobront isobutane isobutyl nitrite isobutyl propionate isobutylene

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