isinglass /īˈzing-gläs/

1. A material, mainly gelatine, obtained from sturgeons' air-bladders and other sources
2. Thin transparent sheets of mica

• head-stream
• head-streams
• headstrong
• heads-up
• heads-ups
• heads will roll
• head teacher
• head teachers
• head-tire
• head-tires
• head to head
• head-to-head
• head up
• head-up display
• head voice
• head voices
• head waiter
• head waiters
• headwall
• headwater
• headwaters
• headway
• headways
• headwind
• headwinds