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

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n. Plural form of affine.

n. Two or more in-laws; parents-in-law, siblings-in-law, and other relatives by marriage; may refer to groups related to one another by marriage.

"¶ Our auctour also in a great worke that he hath made vpon Rhetorike/declareth the handelynge of a theme symple by the same example of Iustice/addynge two pla [-] ces mo/whiche are called affines and con - traries on this maner."

Heinz    Hines    Pines    aligns    alines    assigns    bines    brines    clines    combines