How to spell SISTERIN correctly?

The correct spelling for "sisterin" could be "sister-in-law" or "sistering". "Sister-in-law" refers to a woman who is married to someone's sibling, while "sistering" is a carpentry term that refers to strengthening or supporting a joist or beam by attaching another piece of wood to it.

• cistern The old house had a rainwater cistern in the backyard.
• Listerine After brushing my teeth, I always use Listerine to rinse my mouth.

Intertubing

• antedating
• entertain
• entertainer
• entertaining
• inditing
• inner-tubing
• intertwine
• interurban
• intuiting
• undertaking