A double-blind study in which neither the subject nor the observer knows the identity of the control or variable.
double rainbowRead more in this article about some frequently asked questions and fun facts related to our definitions.
Don’t Get Into Double Trouble With Double NegativesWhat’s a double negative? A double negative is when two negative words or constructions are used within a single clause. Sentences with double negatives are not grammatically correct . . . and they’re confusing. That’s because double negatives cancel each other out and make a positive. So, when you use a double negative it ends up being the exact opposite of what you mean. You’ll …
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.