Merriam-Webster's Word of the Day for October 19, 2026, is fervid. Fervid is an adjective used to describe intense feelings. It characterizes people or things that are expressive of strong emotions. For instance, fervid letters can convey deep emotions between friends. Superfans often exhibit fervid interest in celebrities, leading to public scrutiny. The word fervid originates from the Latin verb fervēre, meaning "to boil." This Latin root also gave rise to the similar word fervent. While fervid implies spontaneous or feverish emotional expression, fervent denotes steady and sincere emotional warmth. Both words share a common origin with "ferment," reflecting the idea of bubbling or intense processes. Therefore, fervid captures a passionate and often outwardly displayed intensity of feeling.