useless trivia: What Word Means: A Feeling Bordering On Anxiety?

Questions

Name a flattened, wingless insect that lives on warm-blooded animals?

Name applied originally to naturally occurring esters of fatty acids & monohydric alcohols, but now applied to both natural & manufactured products resembling these esters?

Name applied to a ship to indicate that it is a very fast sailer?

Name applied to any craft having twin hulls?

Name applied to any plant that retains its foliage through two or more consecutive seasons?