-oid, -oidal, -oidism, -odic

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

spermatozoid
An antherozoid; a free-swiming male gamete.
spermotoid
speroid
spheroid, ellipsoid of revolution
1. A three-dimensional object that is shaped like a sphere, but is not perfectly round; such as, an ellipsoid or a geometric surface or a solid figure shaped like an oval.
2. Having a shape that is approximately spherical.
3. Any globular body, or one resembling a sphere.
4. An ellipsoid (a geometric surface or a solid figure shaped like an oval) generated by the rotation of an ellipse (a two-dimensional shape like a stretched circle with slightly longer flatter sides) around one of its axes or a straight line around which a geometric figure or a three-dimensional object is symmetrical.
spheroidal
1. Relating to or referring to something that is shaped like a spheroid.
2. A body that is shaped like, or resembles, a sphere, but is not perfectly round or spherical.
3. Roughly spherical, approximately round or ball shaped.
sphygmoid (adjective), more sphygmoid, most sphygmoid
splenoid
sporoid
sternoid
syncytoid
syringoid
systemoid
tabloid
talpoid
tentaculoid (adjective), more tentaculoid, most tentaculoid
Resembling or similar to a variety of slender, flexible processes or appendages in animals; especially, invertebrates, that serve as devices for touching, feeling, and catching food: Members of the tentaculoid species are specialized carnivorous predators with sucker-lined tentacles and well-developed sense organs.

Some of the more tentaculoid animals are larger than most of the other invertebrates (without backbones); for example, the giant squid, "Architeuthis", may develop into 20 meters (slightly over 65 feet) in length, which is said to be by far the largest of the living invertebrate tentaculoid species.

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