Medical Definition of umbelliferone
: a crystalline phenolic lactone C9H6O3 obtained by the distillation of resins (as galbanum or asafetida) from various plants of the family Umbelliferae
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
“In Vino Veritas” and Other Latin Phrases to Live By
Top 10 Latin Phrases
Galaxy Brain: Words for Thought and Thinking
What's (another word for) the big idea?
Merriam-Webster's Words of the Week - Jan. 14
From the week ending 1/14/2022
8 Colors from the Bigger Crayon Box
Here's where those fancy shades get their names.
Ask the Editors