This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. Simple past tense and past participle of halve.

adj. Appearing as if one side, or one half, were cut away; dimidiate.

In botany, with one half, or nearly so, of a nominally bilateral organ wanting, as in the leaves of some begonias; dimidiate.

In golf, having the same score on each side: as, a hole is halved when each side takes the same number of strokes; a match is halved when both sides have won the same number of holes, or have proved equal; etc.

"Underscoring those concerns, South Korea's LG Display Co. said Thursday its third-quarter profit more than halved from the year-earlier period, largely due to weak panel prices as demand for consumer electronics sagged."

dimidiate   

halve