Silt Definition: Sediment Particles & How It Forms

Meaning 1：sediment particles (silt)

silt 🔊

/sɪlt/

Fine soil particles that water carries and then drops when the water slows down, found on riverbeds or lake bottoms.

Close-up photo of riverbank silt showing fine brown sediment layers and texture

sediment particles 🔊

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/ˈsedɪmənt ˈpɑːtɪklz/

Fine particles of soil or mineral matter that are transported and deposited by water, especially in slow-moving bodies of water like rivers and lakes.

📁 Category：Natural Geography 🔖 Level：Intermediate

📘 Details & Usage

📖 Root Explanation

Originates from Middle English 'cylte' meaning a salt marsh or fen.

💡 Mnemonic

SILT = Silky, Light, Tiny grains left behind by water.

📖 Example

The bottom of the riverbed is covered in soft, brown silt from years of water flow. 🔊 The bottom of the riverbed is covered in soft, brown sediment particles from years of water flow.

🔗 Collocations

silt deposition – The process of silt settling out of water.

silt load – The amount of fine sediment carried by a river.

silt up – To become filled or blocked with silt.

🔄 Synonyms

sediment (n.) – Matter that settles to the bottom of a liquid.

mud (n.) – Soft, wet earth that can contain silt, clay, and organic matter.

alluvium (n.) – Loose soil or sediment deposited by flowing water.

🚫 Antonyms

gravel (n.) – Small stones and pebbles, coarser than silt.

boulder (n.) – A very large rock, much larger than silt particles.

🌱 Derivatives

silty (adj.) – Containing or resembling silt.

siltation (n.) – The process of becoming choked or filled with silt.

📖 Cultural Story

Derived from Middle English 'cylte' or related Old Norse words for a salty marsh, the term later specialized in geology and agriculture to describe fine-grained, fertile sediment crucial for farming deltas and river valleys.