- eidosForm; essence; type; species.
- eidouranionA kind of orrery that combined mechanical movement with a method of back projection.
- fistularioidResembling the genus Fistularia (cornetfishes); having a long, tubular body.
- mattoidDisplaying erratic behaviour
- oroideAn alloy of copper and zinc or tin that has a gold color, used in making inexpensive jewelry.
- phoneidoscopeAn instrument for studying sound waves by optical means. It consists of a tube across whose end is stretched a film of soap solution thin enough to give coloured bands, whose form and position are affected by sound vibrations.
- polyeidicPassing through several distinct larval forms; having several distinct kinds of young.
- staminodeAn abortive stamen, or any organ modified from an abortive stamen; a staminodium