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# sentinel

noun (a sentinel, sentinels)

«sentinel» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A soldier or guard whose job is to watch for danger; a sentry. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#m1)
2. Something that stands like a guard or watches over a place: a tree standing sentinel on a hill. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#m2)
3. (science, medicine) Something used to give early warning: a sentinel species (like canaries in coal mines) or a sentinel node. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#m3)

### In the lessons

In history and stories, sentinels guard castle walls and gates. "Stand sentinel" means stand still and watch. In science, scientists use sentinel animals or plants to warn of pollution. Phrases: stand sentinel, keep sentinel, a lone sentinel.

### Examples

- A sentinel stood on the castle wall. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x1)
- The old oak stood sentinel over the village. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x2)
- The sentinel shouted a warning when he saw the enemy. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x3)
- Canaries were once sentinels for gas in coal mines. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x4)
- The lighthouse is a lonely sentinel by the sea. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x5)
- Robots act as sentinels in the sci-fi film. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x6)
- At each castle stood little princes acting as sentinels. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/#x7)

### Note

Countable: a sentinel, sentinels. Similar: sentry, guard, lookout. "Sentinel" sounds more formal or poetic than "sentry".

## On Mova

- [Trees and pragmatics of «sentinel» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sentinel/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«sentinel» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/sentinel.html) on Mova free.