World English Dictionary
1.  divided in halves
2.  rare biology having one of two sides or parts less developed than the other: dimidiate antlers
3.  (tr) heraldry to halve (two bearings) so that they can be represented on the same shield
[C17: from Latin dīmidiāre to halve, from dīmidius half, from dis- apart + medius middle]

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