In some Gorgonacea, an internode is the hard, calcareous segment of an axis.
In hydroids, an internode is a 'segment' of hydroid stem (hydrocaulus) or branch (hydrocladium), typically one 'zig' of a zig-zag or flexuose stem or branch; often delimited above and below by one or more rings (annulus, annuli) in the outer tube (perisarc) at an obvious but ill-defined point which is termed node.

Alternative form for internode : internodes.