1. (noun) a place of especial vulnerability

• weak part
• weak spot

2. (noun) any membranous gap between the bones of the cranium in an infant or fetus

• fontanel
• fontanelle

1. (noun) a place of especial vulnerability

• achilles' heel
• jugular
• underbelly

2. (noun) any membranous gap between the bones of the cranium in an infant or fetus

• anterior fontanelle
• sphenoid fontanel
• sphenoid fontanelle
• sphenoidal fontanel
• sphenoidal fontanelle

1. (noun) a place of especial vulnerability

• weakness

2. (noun) a sentimental affection

• affection
• affectionateness
• fondness
• heart
• philia
• tenderness
• warmheartedness
• warmness

3. (noun) any membranous gap between the bones of the cranium in an infant or fetus

• opening
• orifice
• porta

1. (noun) a place of especial vulnerability

• good part