QUIZWORD by Alan Shuker

Puzzle No 1612

Clues across

1. What is theatrical slang for laughing involuntarily while on stage? (8)

7. What is the capital of Nigeria? (5)

8. What is the Maryland country retreat for the president of the United States? (4,5)

9. Which colour pigment was obtained from cinnabar, a toxic ore of mercury? (3)

10. What is a shaft on which a wheel rotates? (4)

11. Solidified carbon dioxide is known as what? (3,3)

13. The tree Ficus macrophylla, recognised by its imposing buttress roots, is better known as what? (7,3,3)

15. What is to abruptly stop talking about something? (4,2)

16. What short straight whip is carried by a horse rider? (4)

18. What is the name of the computer in 2001: A, coincidentally a one letter shift from IBM? (3)