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The Collaborative International Dictionary of English v.0.48 (gcide)

Is- \Is-\
See {Iso-}.
[1913 Webster]


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.
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For thy is I come, and eke Alain. --Chaucer.
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Aye is thou merry. --Chaucer.
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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.
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To-morrow is the new moon. --1 Sam. xx.
5.
Isabel


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]