English Reference
noun

dissection

n.
US /ˈdaɪsɛkʃən/ UK /daɪsˈɛkʃən/ dis·sec·tion UK spelling dissections

  1. 01 C1 Advanced Technical Science

    the act of cutting open a plant or animal body to study its parts.

    the process of cutting apart an organism or tissue to examine its internal structure for scientific or medical purposes.

    Simple

    In biology class, we performed a dissection of a frog to see its heart.

    In context

    The medical students spent the morning performing a careful dissection of the thoracic cavity to identify the major arteries.

    Usage

    Often used with the preposition 'of'.

  2. 02 C1 Advanced Academic

    a very careful and detailed examination of a piece of writing, an idea, or an event.

    a minute and critical examination or analysis of a concept, text, or situation.

    Simple

    The journalist's dissection of the new law showed many hidden problems.

    In context

    The professor's thorough dissection of the poem revealed layers of meaning that the students had completely overlooked.

    Usage

    Commonly used in academic or critical contexts to describe intellectual work.

  3. 03 C2 Proficiency TechnicalFormal Medicine

    the surgical removal of a part of the body, such as a tumor or lymph nodes.

    the surgical excision or removal of tissue, often used in the context of oncology.

    Simple

    The surgeon recommended a neck dissection to remove the affected lymph nodes.

    In context

    Following the diagnosis, the patient underwent a radical dissection to ensure that all malignant tissue was successfully removed.

    Usage

    Typically found in surgical reports and medical literature.

Since the publication of De Humani Corporis Fabrica by Andreas Vesalius in 1543 – the first comprehensive anatomy book based on direct observation of human dissection – anatomy has carried an air of authority.

ScienceDaily· 21 Jun 2026

Borrowed from Latin dissectiōnem, perhaps via Middle French dissection. By surface analysis, dissect + -ion.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin frm dissection
Level C1 · Advanced
Frequency Occasional
Updated