What context can I use each word in?
Learn when and how to use these words with these examples!
ostium
Example
The ostium of the heart valve allows blood to flow in one direction. [ostium: noun]
Example
The ostia of the sponge are used for water circulation and feeding. [ostia: plural noun]
opening
Example
The opening in the wall was big enough for the cat to crawl through. [opening: noun]
Example
The opening ceremony of the Olympics is always spectacular. [opening: adjective]
Good things to know
Which word is more common?
Opening is more commonly used than ostium in everyday language, and is more familiar to most English speakers.
What’s the difference in the tone of formality between ostium and opening?
Ostium is more technical and formal than opening, which is more commonly used in informal and everyday contexts.
