sessile

/'sesil/

Thân thiện

A sessile barnacle is attached to a large rock in the tide pool.

Definition

1. Adjective:
   • Attached directly by the base; not having an intervening stalk: Describes a structure, especially in botany, that is directly attached to its base without a stalk or peduncle.
   • Permanently attached to a substrate; not free to move about: Describes an organism, often in marine biology, that is fixed in one place and cannot move independently.

Usage Examples

• Adjective:
  • The oyster is a sessile organism, cemented to the rock for its entire adult life.
  • Botanists noted the sessile leaves, which grew directly from the plant's stem without petioles.

Advanced Usage

• In scientific contexts, "sessile" is often contrasted with "motile" (capable of movement) or "pedunculate" (having a stalk).
  • The transition from a motile larval stage to a sessile adult form is common in many marine invertebrates.

Variants and Related Words

• Sessility (n): The state or quality of being sessile.
  • The sessility of the barnacle makes it highly dependent on water currents for feeding.

Synonyms

• Fixed: Securely placed or fastened; stationary.
• Attached: Joined or fastened to something.
• Stationary: Not moving or not intended to be moved.

Antonyms

• Motile: (Of cells, organisms, or their parts) capable of motion.
• Pedunculate: (Botany) having a peduncle or stalk.
• Free-living: Not attached to a substrate and capable of independent movement.

Học thuật

Adjective

1. attached directly by the base; not having an intervening stalk
   • sessile flowers
   • the shell of a sessile barnacle is attached directly to a substrate
2. permanently attached to a substrate; not free to move about
   • sessile marine animals and plants

Từ đồng nghĩa

• stalkless