-oid, -oidal, -oidism, -odic

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

oniroid
Like or resembling a dream.
onychoid
Resembling a nail of the finger or the toe in structure or form.
ooid
ootocoid
oozooid, oozoid
1. Any individual developed from an egg.
2. A zooid or individual unit of a colonial organism, developing from an ovum, as distinct from a blatozooid which develops by budding.

The terms are used with reference to colonies of tunicates (e.g. sea-squirts) or similar organisms.

ophioid
Pertaining to, similar to, or resembling snakes.
opsonoid (adjective)
Resembling an opsonin or a constituent of normal or immune blood serum that makes invading bacteria more susceptible to the destructive action of the phagocytes (cells that are able to surround, to engulf, and to digest microorganisms and cellular debris).
organoid
Resembling an organ or a structure that resembles an organ.
osteoid
ostracoid
ostreoid
ovoid
ovomucoid
Egg white protein produced in tubular gland cells in the epithelium of the chicken (or bird) oviduct in response to progesterone or estrogen.
pachydermatoid
pachydermoid

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