Definition

Noun: A small, cup-shaped structure made of hardened, modified leaves (bracts) that surrounds and supports the base of an acorn, attaching it to the oak tree branch.

Usage

The term "acorn cup" refers specifically to the botanical part of the fruit of an oak tree. It is a countable noun. - The squirrel discarded the acorn but left the acorn cup on the ground. - You can identify the type of oak by the shape and texture of its acorn cup.

Advanced Usage

• In botanical descriptions, the acorn cup is also known as a cupule. This is a more technical term for the same structure.
• The pattern or scaliness of the cup is a key feature for dendrology (the study of trees).

Variants and Related Words

• Cupule (n): The technical botanical term for an acorn cup or a similar structure in other plants.
• Acorn (n): The nut itself, which sits within the cup.

Synonyms

• Cupule (technical synonym)

Notes

This is a compound noun. The word "acorn" modifies "cup" to specify the type of cup. It is a single, specific concept in botany and is always used as a whole.

Noun

1. cup-shaped structure of hardened bracts at the base of an acorn