-eous +

(Latin: a suffix; composed of, of the nature of, like)

nectareous
1. Of the nature of or resembling nectar.
2. Delicious or sweet.
3. Pertaining to, containing, or resembling nectar; delicious; nectarean.
orchidaceous
Resembling an orchid (flower) in some way, especially in being showy.
palmaceous
A reference to the palms; of the nature of, or resembling, palms.
papyraceous
Of the consistence or thinness of paper; of the nature of paper; made of or resembling paper; papery.
periosteous
1. Relating to the periosteum.
2. Situated around bone; of or pertaining to the periosteum.
plumbeous (adjective)
Resembling, consisting of, or containing lead; leaden.
poaceous
In botany, having the nature of meadow grass; belonging to meadow grass.
roboreous (adjective), more roboreous, most roboreous
Of the nature of or pertaining to oak which is symbolic of strength.
suppedaneous
A reference to the soles of the feet.
terraceous
Earthen or of the earth.
terreous
Consisting of earth; earthy; as, terreous substances; terreous particles.
testudineous
Resembling a tortoise shell.
vinaceous (adjective), more vinaceous, most vinaceous
Relating to the reddish color of wine; wine-colored.
vitreous
1. Resembling glass.
2. Relating to, resembling, or having the nature of glass; glassy.
3. Obtained or made from glass.
4. Of or relating to the vitreous humor.
5. Glasslike or hyaline; often used alone to designate the vitreous body of the eye.

The vitreous body refers to the transparent gel that fills the inner portion of the eyeball between the lens and the retina; also called, hyaloid body, humor cristallinus, and crystalline or vitreous humor.

Also see this closely related -aceous suffix unit.