ef-ih-KAY-shus
(adjective) Effective in producing the desired result.
The vaccine proved highly efficacious in preventing disease.
Fun Fact
While “effective” and “efficacious” are similar, the latter is usually used in formal, academic, or scientific contexts. For instance, in pharmaceutical trials, a drug must be “efficacious” before it can be deemed “effective” for general use. It’s a favorite in public health and policy.
SEM-uh-for
(noun) a system of conveying information through visual signals, often using flags, lights, or mechanical arms, especially over long distances.
Before modern radio communication, ships relied on semaphore to send urgent messages across open water.
Semaphore comes from the early 19th-century French word sémaphore, which itself is rooted in the Greek words sēma (meaning “sign”) and phoros (meaning “bearing” or “carrying”), literally translating to “sign-bearer.” The term was first used to describe mechanical signaling towers across France that transmitted messages visually from station to station long before electrical communication existed.
Fun Fact
Semaphore comes from the early 19th-century French word sémaphore, which itself is rooted in the Greek words sēma (meaning “sign”) and phoros (meaning “bearing” or “carrying”), literally translating to “sign-bearer.” The term was first used to describe mechanical signaling towers across France that transmitted messages visually from station to station long before electrical communication existed.
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