-oid, -oidal, -oidism, -odic

(Greek: a suffix; like, resembling, similar to, form)

placoid (adjective)
planetoid
planetoid, planetoidal
1. A branch of astronomy that studies the origin and composition of the planets and other solid bodies in the solar system such as comets and meteors; asteroid.
2. A body resembling a planet; a name sometimes given to the minor planets or asteroids.
3. Of or belonging to the astroids.
pleurotyphoid
Typhoid fever in which the early stage is masked by the physical signs of pleurisy.
ploidy
polaroidâ„¢
polyploid
Having more than twice the basic number of chromosomes.
polyploidy
The chromosomal constitution of a cell containing multiples of the normal number of chromosomes.
poroid, poral
A description of mushrooms that form pores rather than gills.
psylloid
Similar to or like a flea.
pteridoid
pteroid
pterygoid
reptiloid
reticuloid

Inter-related cross references, directly or indirectly, involving word units dealing with "form, shape, appearance": eido-; figur-; form-; icono-; ideo-; imag-; morpho-; typo-.