umbilicus

"The historian carefully examined the ancient manuscripts to learn about life in the Middle Ages. "

"an aperture in a wall"

"My grandfather is a birdwatcher and can identify almost any bird by its song. "

"The aircraft carrier acted as a mothership for the fighter jets, launching and recovering them during the mission. "

"I think this piece connects to that piece over there."

"Sarah's depression made it hard to enjoy her usual school activities and look forward to the future. "

"The road's curvatures made it difficult to see oncoming traffic. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"We will ornament the windows with trim to make the room seem brighter."

"The characteristic smell of freshly baked bread always reminds me of my grandmother's kitchen. "

"The spacecraft carried astronauts to the International Space Station. "

"to transfer the laws of one country to another; to transfer suspicion"