Definition

1. Noun:
   • A simple leaf shaped like a capital delta: A deltoid leaf is a type of simple leaf (not divided into leaflets) whose overall shape resembles an equilateral triangle, similar to the uppercase Greek letter delta (Δ).

Usage Examples

• Noun:
  • The poplar tree is easily identified by its distinctive deltoid leaf.
  • Botanists noted the plant's deltoid leaf, which was broad at the base and tapered to a point.

Advanced Usage

• In Botanical Description: The term is used in formal botanical keys and descriptions to classify and identify plant species based on leaf morphology.
  • The species key states: "Leaves alternate, simple, with a deltoid leaf shape."

Variants and Related Words

• Deltoid (adj): Triangular in shape.
  • The muscle is named for its deltoid shape.
• Simple leaf (n): A leaf that is not divided into separate leaflets.
• Cordate leaf (n): A heart-shaped leaf.
• Lanceolate leaf (n): A leaf shaped like a lance head, much longer than wide.

Synonyms

• Triangular leaf: A leaf with a three-sided shape.
• Delta-shaped leaf: A leaf shaped like the Greek letter delta.

Related Phrases

• Deltoid leaf base: Refers specifically to the triangular shape at the point where the leaf blade joins the petiole (leaf stem).
  • The identification was confirmed by the deltoid leaf base.

Related Idioms

(This is a specific botanical term, and no common idioms are associated with it.)

Noun

1. a simple leaf shaped like a capital delta