-eous +

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

Needle-like, stinging.
1. Of the nature of the white of an egg, albuminous.
2. Resembling the boiled white of an egg.
3. Relating to any tunica albuginea.
aqueous (adjective), more aqueous, most aqueous
1. Watery; prepared with water: The soup was more aqueous than Sarina likes because she prefers thick soups.
2. The watery or fluid layer in the eye between the cornea and the lens: The ophthalmologist was concerned about the dehydrating state of the aqueous layer or humor in the patient's eyes.
3. In chemistry, relating to or dissolved in water; a solution containing water: The scientist used a simple aqueous solution of salt and water as a disinfectant.
4. In geology, formed from matter deposited by or in water: Certain sedimentary rocks; such as, limestone, are aqueous.
Made by, with, or from water .
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1. Relating to or resembling a tree.
2. Living in trees; arboreal.
3. Having many trees; wooded.
4. Forming a tree trunk, as distinguished from a shrub.
Consisting of chyle that is much diluted with water.

It refers to a liquid which forms the circulating fluid of some inferior animals.

Spiral, screw-like.
Consisting of copper or resembling copper; coppery.
1. Resembling ivory; ivory-colored.
2. Having the appearance of ivory.
erroneous (adjective), more erroneous, most erroneous
1. Containing or derived from a mistake: Based on the information at the time of publication, the scientist reached an erroneous conclusion.
2. Descriptive of being wrong, based on an incorrect assumption, or containing something that is not right: Steve was told that his facts were correct, but his erroneous conclusions were not acceptable.
3. A reference to straying from what is moral, decent, proper, etc.: Harriet's son committed an erroneous action by staying up beyond his bedtime and watching TV even though he was going to school in the morning.
extemporaneous (adjective), more extemporaneous, most extemporaneous
1. Relating to a performance without any preparation: After receiving so much applause after completing the recital, the pianist gave an extemporaneous encore.
2. Pertaining to being prepared in advance but delivered without notes: Alfred spent the whole afternoon thinking and writing down what he wanted to say at his farewell ceremony the next evening so that he could give an extemporaneous speech without using his rough draft from the day before.
3. Referring to speaking without preparation or notes; literally, "out of the moment": Rick gave a short extemporaneous speech after he received the first prize in the debate club.
4. Descriptive of taking place with little or no prior preparation or practice: Dr. Thomas gave an extemporaneous talk on the importance of good health at the meeting because the main speaker suddenly became ill with a fever!
Pertaining to, consisting of, or resembling, flame.
Belonging to, or having the texture or nature of foliage or leaves; leaflike in form or made of growth; composed of thin laminated layers, as certain rocks.
Typical of an herb as distinguished from a woody plant; green and leaflike in appearance or texture.
igneous (adjective)
1. Of fire, fiery; typical of fire; relating to or characteristic of fire.
2. In geology, formed by solidification from a molten or partially molten state (used of rocks or relating to rocks so formed): "Granite and basalt are igneous rocks."
3. Relating to a rock that was formed by solidification from molten or partly molten material; one of the three principal classification of rocks along with metamorphic and sedimentary: "Such materials are a result of, or are produced by, the action of great heat."
luteous (adjective)
Like mud or clay.

Also see this closely related -aceous suffix unit.