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

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or pertaining to heterosis

adj. Describing a hybrid form of string theory (See Heterotic string on Wikipedia)

"Once established in a deme, a negatively heterotic one with a selective disadvantage for heterozygotes–DW gene arrangement can spread in homozygous form through a subdivided population by random local extinction and colonization."