trefoil

IPA/ˈtrefɔɪl/
IPA/ˈtrefɔɪl/

trefoil — noun

1. a type of small, wild plant whose leaves grow in three separate parts, belonging

1.nounC1
Definition

a type of small, wild plant whose leaves grow in three separate parts, belonging to the same plant family as clover

Example

Rachel found a patch of wild trefoil growing beside the old stone wall.

patch of wild trefoil — common habitat description

The gardener showed the students how to identify trefoil by its three-part leaves.

identify [plant] by [feature]

Common collocations
  • wild trefoil
  • trefoil leaves
  • patch of trefoil
  • trefoil plant
  • identify trefoil
Synonyms
  • clover

    broader term used in everyday speech; trefoil is more formal and botanical

  • shamrock

    a particular type of clover, traditionally used as a symbol of Ireland

Usage Note

In everyday conversation, most speakers use 'clover' rather than 'trefoil' for the plant. 'Trefoil' is more common in botanical writing or formal descriptions of wild plants.

Common Mistakes

A four-leaf clover is a rare kind of trefoil.
A four-leaf clover is a rare variation of clover, while trefoil always has exactly three leaves.
Trefoil refers to three-part leaves; a four-leaf clover is an anomaly within the clover family.

2. a decorative shape or pattern made from three sweeping curves that meet around a

2.nounC1
Definition

a decorative shape or pattern made from three sweeping curves that meet around a central point, based on the look of a trefoil leaf

Example

The old church has a trefoil carved into each stone arch above the windows.

trefoil carved into [stonework] — architectural use

Stefan painted a small trefoil symbol on the cover of his nature journal.

Common collocations
  • trefoil pattern
  • trefoil design
  • trefoil decoration
  • trefoil arch
  • trefoil motif
  • carved trefoil
Synonyms
  • three-lobed design

    descriptive term used in architecture and design when 'trefoil' feels too technical

  • cloverleaf

    refers to the same three-lobed shape, especially in road interchanges or decorative patterns

Usage Note

This sense is most common in descriptions of Gothic architecture, stained glass, heraldry, and decorative metalwork. 'Trefoil' here names the shape itself, not a plant.

Common Mistakes

The Olympic rings form a trefoil.
The Olympic symbol has five separate rings. A trefoil is a three-lobed design based on a leaf shape.
Learners sometimes confuse any circular symbol arrangement with trefoil.

Word family

  • trifoliate
    adjectiveC2

Synonym discussion

Sense: noun/1

'Clover' is the everyday name for the low-growing plant with round flower heads, and it can describe any member of the Trifolium genus. 'Trefoil' is a more formal, botanical term that includes clover but also covers other small wild plants with three-part leaves, such as bird's-foot trefoil. 'Shamrock' is a cultural label — a three-leaf sprig of clover used as the national emblem of Ireland; not every trefoil is a shamrock. 'Alfalfa' belongs to the same plant family but has narrower leaflets and grows taller than typical trefoil plants. In a garden setting, you would call a patch of small three-leaf plants 'clover' in casual speech and 'trefoil' in a written plant guide.

clover ↗shamrockalfalfa

Etymology

LatinFrenchEnglish

The word 'trefoil' comes from Latin 'trifolium', a combination of 'tri-' (three) and 'folium' (leaf). It entered English through Old French, where it was spelled 'trifoil'. The Latin name was originally a botanical term for any plant with three leaves, and the decorative meaning grew out of that, since the shape imitates the plant.

First known use

15th century

15th century, in the meaning defined at sense 1a