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Webster 1913 Edition

Is-

Is-

.
See
Iso-
.
{

I′so-

,

Is-

. }
[Gr.
ἴσοσ
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.

Definition 2024

is-

is-

See also: Appendix:Variations of "is"

English

Prefix

is-

  1. form of iso- before a vowel

Derived terms

French

Prefix

is-

  1. form of iso- before a vowel

Derived terms

Welsh

Prefix

is-

  1. sub–; vice–

Usage notes

Triggers the soft mutation on the noun following.

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