1. (noun) informal terms for a human head

• attic
• bean
• bonce
• noggin
• noodle

2. (noun) a stadium that has a roof

• covered stadium
• domed stadium

1. (noun) a concave shape whose distinguishing characteristic is that the concavity faces downward

• concave shape
• concavity
• incurvation
• incurvature

2. (noun) informal terms for a human head

• human head

3. (noun) a stadium that has a roof

• arena
• bowl
• sports stadium
• stadium

4. (noun) a hemispherical roof

• roof

1. (noun) a hemispherical roof

• astrodome
• cupola
• geodesic dome
• onion dome
• pressure dome
• whispering dome
• whispering gallery

1. (noun) informal terms for a human head

• bean