cosinage

from The Century Dictionary.

• noun In law: Collateral relationship or kinship by blood; consanguinity.
• noun A writ to recover possession of an estate in lands when a stranger had entered and abated, after the death of the tresail (the grandfather's grandfather) or other collateral relation.

from the GNU version of the Collaborative International Dictionary of English.

• noun Collateral relationship or kindred by blood; consanguinity.
• noun A writ to recover possession of an estate in lands, when a stranger has entered, after the death of the grandfather's grandfather, or other distant collateral relation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Collateral relationship or kindred by blood; consanguinity.
• noun law A writ to recover possession of an estate in lands, when a stranger has entered, after the death of the grandfather's grandfather, or other distant collateral relation.