| omnium-gatherum |
a miscellaneous collection; miscellany. |
| omnivore |
an animal that feeds on both plants and animals. |
| omnivorous |
living on a diet of both plant and animal food. [3 definitions] |
| omophagia |
the eating of raw meat. |
| omphalos |
the navel or bellybutton. [2 definitions] |
| -on1 |
subatomic particle. [3 definitions] |
| -on2 |
used in naming inert gases. |
| -on3 |
a chemical compound that does not contain oxygen in a carbonyl group. |
| on |
above and supported by. [19 definitions] |
| on account of |
because of. |
| on a dime |
(informal) with great quickness, precision, or accuracy. |
| on and on |
at excessive length. |
| on an even keel |
well-balanced or stable. |
| onanism |
self-gratification, esp. masturbation. [2 definitions] |
| on approval |
for determination of satisfaction, without obligation to buy. |
| on a silver platter |
without having to expend effort; undeservedly. |
| on bail |
temporarily released from custody after bail is given. |
| onboard |
transported, used, or installed upon a ship, aircraft, or other vehicle. [4 definitions] |
| once |
at one time in the past; formerly. [7 definitions] |
| once and for all |
firmly and decisively, with absolute finality. [2 definitions] |
| once in a blue moon |
from time to time, but very rarely. |