-oid, -oidal, -oidism, -odic

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

acanthoid (adjective), more acanthoid, most acanthoid
Resembling a spine, spine shaped; spinous: Thomas observed the porcupine with its acanthoid and spiny covering intended to protect it from prey.
acanthozooid (s) (noun), acanthozooids (pl)
An animal with spines or spine-like growths: An acanthozooid is a member of the sessile aquatic coelomates and emits little tube-shaped structures extending as needle-like projections above the surface of the colony.
acaroid (adjective), more acaroid, most acaroid
Resembling a mite, or mite-like: This term pertains to an acaroid form of an Acarus or a mite.
acidoid (adjective) (not comparable)
Similar to or like acid: Some substances can be acidoid in that they are comparable to an acid.
acromegaloidism (s) (noun) (no pl)
A bodily condition resembling acromegaly but not due to pituitary disorder; pseudoacromegaly: Acromegaloidism can be triggered by a tumor in the lungs, in the pancreas, or in the adrenal glands.

It is often connected to an insulin resistance.

acrostichoid (adjective) (not comparable)
In botany, regarding the family Polypodiaceae of the genus of Acrostichum: All of the tropical acrostichoid ferns have the sporangia coating all on the underside of the fronds.
actinoid (adjective) (not comparable)
Concerning the form of rays: rayed; The shape of the starfish or sea anemone is typically actinoid.
adenoid (adjective) (not comparable)
Resembling a gland: Jack had to go to the doctor because of a severe adenoid condition with a greatly enlarged mass of lymphoid tissue at the back of his nose.
adipoid (adjective) (not comparable)
Resembling fat; lipoid: There are two adipoid groups, the simple lipids and the complex lipids, which are present in all living cells.
Aeluroid
Belonging to, or having the characteristics of, the division Aeluroidea of Carnivora, comprising the feline and allied families; as an animal of this division.
albinoid, albinoidism, albinoism
Resembling an albino; having the appearance of an albino.
albuminoid
Like or resembling albumen; of the same character as albumen.
albumoid
aleuronoid
Resembling flour.
algoid
Resembling, or of the nature of seaweed.

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