(chess) A file with only pawns of one color on it.

plural of half-open file

A half-sister of one's mother. / A half sister-in-law of one's mother.

plural of maternal half aunt

A half-brother of one's mother. / A half brother-in-law of one's mother.

plural of paternal half aunt

The offspring of a parent's half-sibling.

A half-sister of one's father. / A half sister-in-law of one's father.

plural of paternal half-uncle

A half-brother of one's father. / A half brother-in-law of one's father.