DEMO MODE:
DEMO MODE:
You're trying this activity as a guest! Sign in or Create a free account to save your scores and earn certificates.
INSTRUCTIONS:
INSTRUCTIONS:
Type the full vocabulary term (no abbreviations) that best matches the given definition in quotes. The first letter is given as a hint.
noun (thing)
Question 1 of 20
US
UK
a slimy fluid produced by the body to help protect vulnerable areas from dust and germs