| datum plane, datum level or datum line | |
| —n | |
| surveying the horizontal plane from which heights and depths are calculated | |
| datum level, datum level or datum line | |
| —n | |
| datum line, datum level or datum line | |
| —n | |
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| a chattering or flighty, light-headed person. |
| a stew of meat, vegetables, potatoes, etc. |