A small stream or brook, typically a minor tributary that flows into a larger body of water. These tiny watercourses often form the headwaters of river systems and may be seasonal or permanent depending on local conditions.
From French 'rivulet,' a diminutive of 'rivière' (river), ultimately from Latin 'rivus' (stream). The word entered English in the 17th century, maintaining its sense of a small, flowing watercourse.
Every mighty river begins as countless rivulets - the Amazon River system starts with thousands of tiny streams flowing down the Andes, each rivulet contributing to what becomes the world's largest river by volume! These small streams are crucial for local ecosystems and often disappear during drought, making them sensitive indicators of climate change.
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