| OO | (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto |
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| OO | used especially of lower plants |
| OO | a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi |
| OO | mature ovum after penetration by sperm but before the formation of a zygote |
| OO | the process of seeping |
| OO | any thick messy substance |
| OO | release (a liquid) in drops or small quantities |
| OO | pass gradually or leak through or as if through small openings |
| OO | a very soft leather made from the skins of calves and having a suede finish on the flesh side |
| OO | release (a liquid) in drops or small quantities |
| OO | of liquids |
| OO | the process of seeping |