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The Collaborative International Dictionary of English v.0.48:

Is- \Is-\ See Iso-. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Is \Is\, v. i. [AS. is; akin to G. & Goth. ist, L. est, Gr. ?, Skr. asti. [root]9. Cf. Am, Entity, Essence, Absent.] The third person singular of the substantive verb be, in the indicative mood, present tense; as, he is; he is a man. See Be. [1913 Webster] Note: In some varieties of the Northern dialect of Old English, is was used for all persons of the singular. [1913 Webster] For thy is I come, and eke Alain. --Chaucer. [1913 Webster] Aye is thou merry. --Chaucer. [1913 Webster] Note: The idiom of using the present for future events sure to happen is a relic of Old English in which the present and future had the same form; as, this year Christmas is on Friday. [1913 Webster] To-morrow is the new moon. --1 Sam. xx. 5. Isabel
The Collaborative International Dictionary of English v.0.48:

Iso- \I"so-\, Is- \Is-\ [Gr. 'i`sos equal.] A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif.: (a) (Chem.) Applied to certain compounds having the same composition but different properties; as in isocyanic. (b) (Organic Chem.) Applied to compounds of certain isomeric series in whose structure one carbon atom, at least, is connected with three other carbon atoms; -- contrasted with neo- and normal; as in isoparaffine; isopentane. [1913 Webster]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):

IS International Standard (ISO)
V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):

IS International Supplement (ODT)
V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):

IS Intermediate System (ATM)