moss

IPA/mɒs/
KK[mˈɔs]IPA/mɔːs/

moss — noun

  • mosssingular
  • mossesplural

1. a tiny, flowerless plant with small leaf-like structures that grows in dense clu

1.nounB1
Definition

a tiny, flowerless plant with small leaf-like structures that grows in dense clumps on any damp surface — soil, rocks, tree bark, walls — and ranges from bright green to yellowish

Example

The old stone wall in Liam's garden was completely covered in thick green moss.

collocation: covered in moss

Antonia knelt down to feel the soft moss beneath the oak tree.

Common collocations
  • thick moss
  • green moss
  • soft moss
  • patch of moss
  • moss-covered
  • covered with moss
  • overgrown with moss
  • moss grows
  • moss spreads
Synonyms
  • bryophyte

    scientific term for the entire plant division that includes mosses; too technical for everyday conversation

  • sphagnum

    a specific type of moss that grows in bogs, often used in gardening; not a general synonym for all moss

Grammar Patterns

moss + verb (grows, spreads)

covered with/in moss

Common Mistakes

This rock is covered with green lichen.' (when the plant is soft and sponge-like).
This rock is covered with green moss.
Moss is soft and grows in clumps; lichen is flat and crusty.
Look at the moss growing on that tree — it has tiny white flowers.
Look at the moss on that tree
it does not produce flowers.' — Mosses are non-flowering plants; they spread by spores, not seeds or flowers.
Idioms

a rolling stone gathers no moss

idiom

This saying means that someone who keeps moving and changing jobs or homes avoids responsibilities and attachments.

Maya has lived in five cities in three years; a rolling stone gathers no moss.

Diego never stays in one job long, but a rolling stone gathers no moss.

moss — verb

Word family

  • mossy
    adjectiveB2
  • moss-covered
    adjectiveB2
  • mosslike
    adjectiveC1
  • mossiness
    nounC1

Synonym discussion

Sense: noun/1

Moss, lichen, algae, liverwort, and mildew all grow on damp surfaces, but they differ in structure and appearance. Moss is a small, soft, green plant with tiny leaf-like structures that grows upright in clumps. Lichen is a flat, crusty or leafy organism formed from a fungus and an alga living together — it is not a true plant. Algae appear as a slippery green film on wet surfaces and lack any stem or leaf structure. Liverworts resemble moss but have a flatter, ribbon-like shape and grow closer to the ground. Mildew is a whitish or grey fungal growth, typically appearing as a powdery coating on plants or household surfaces. For example, you might pull a clump of moss off a stone wall with your fingers, but you would need to scrape lichen off with a knife.

lichenalgae ↗liverwortmildew ↗

Common collocations

Nouns

Adverbs

Phrases

  • moss over
  • covered with moss
  • overgrown with moss
  • moss-covered

Prepositions

Etymology

Proto-GermanicOld EnglishMiddle EnglishEnglish

The word 'moss' comes from Old English 'mos,' which meant 'bog' or 'swamp' — a sensible origin since mosses thrive in wet, marshy places. This ancient root is shared with Dutch 'mos' and German 'Moos,' all tracing back to Proto-Germanic '*musan.' The same Old English root also gave us 'moor' (open, wet land). By the time of Middle English, 'moss' was used for the plant we know today. A separate Latin root, 'muscus' (moss), later influenced scientific terms like 'muscology' (the study of mosses).