Definify.com
Webster 1913 Edition
Is-
Is-
.See
Iso-
. {
I′so-
,Is-
. }[Gr.
ἴσοσ
equal.] A prefix or combining form, indicating
Specif.: identity
, or equality
; the same numerical value
; as in isopod, isomorphous, isochromatic. (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.