| bisection | (noun) dividing into two equal parts | - |
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| callosectomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosotomy |
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| dissection | (noun) cutting so as to separate into pieces | - |
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| (noun) detailed critical analysis or examination one part at a time (as of a literary work) | - |
| (noun) a minute and critical analysis | - |
| hypophysectomy | (noun) surgical removal of the pituitary gland | - |
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| insect | (noun) small air-breathing arthropod | - |
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| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, louse, worm |
| insecticide | (noun) a chemical used to kill insects | Synonyms: insect powder |
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| insectifuge | (noun) a chemical substance that repels insects | Synonyms: insect repellant, insect repellent |
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| insectivore | (noun) small insect-eating mainly nocturnal terrestrial or fossorial mammals | - |
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| (noun) any organism that feeds mainly on insects | - |
| intersection | (noun) the act of intersecting (as joining by causing your path to intersect your target's path) | - |
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| (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossroad, crossway |
| (noun) a point where lines intersect | Synonyms: intersection point, point of intersection |
| (noun) a representation of common ground between theories or phenomena | Synonyms: convergence, overlap |
| (noun) the set of elements common to two or more sets | Synonyms: Cartesian product, product |
| (noun) a point or set of points common to two or more geometric configurations | - |
| midsection | (noun) the middle area of the human torso (usually in front) | Synonyms: middle, midriff |
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| resection | (noun) surgical removal of part of a structure or organ | - |
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| sect | (noun) a dissenting clique | Synonyms: faction |
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| (noun) a subdivision of a larger religious group | Synonyms: religious order, religious sect |
| sectarian | (noun) a member of a sect | Synonyms: sectarist, sectary |
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| sectarianism | (noun) a narrow-minded adherence to a particular sect or party or denomination | Synonyms: denominationalism |
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| sectarist | (noun) a member of a sect | Synonyms: sectarian, sectary |
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| sectary | (noun) a member of a sect | Synonyms: sectarian, sectarist |
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| section | (noun) the cutting of or into body tissues or organs (especially by a surgeon as part of an operation) | Synonyms: incision, surgical incision |
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| (noun) one of several parts or pieces that fit with others to constitute a whole object | Synonyms: segment |
| (noun) one of the portions into which something is regarded as divided and which together constitute a whole | Synonyms: division, part |
| (noun) a self-contained part of a larger composition (written or musical) | Synonyms: subdivision |
| (noun) a segment of a citrus fruit | - |
| (noun) a small army unit usually having a special function | - |
| (noun) a division of an orchestra containing all instruments of the same class | - |
| (noun) a small team of policemen working as part of a police platoon | - |
| (noun) a specialized division of a large organization | Synonyms: department |
| (noun) a small class of students who are part of a larger course but are taught separately | Synonyms: discussion section |
| (noun) (geometry) the area created by a plane cutting through a solid | Synonyms: plane section |
| (noun) a distinct region or subdivision of a territorial or political area or community or group of people | - |
| (noun) a very thin slice (of tissue or mineral or other substance) for examination under a microscope | - |
| (noun) a land unit equal to 1 square mile | - |
| sectional | (noun) a piece of furniture made up of sections that can be arranged individually or together | - |
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| sectionalisation | (noun) the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart | Synonyms: division, partition, partitioning, sectionalization, segmentation |
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| sectionalism | (noun) a partiality for some particular place | Synonyms: localism, provincialism |
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| sectionalization | (noun) the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart | Synonyms: division, partition, partitioning, sectionalisation, segmentation |
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| sector | (noun) measuring instrument consisting of two graduated arms hinged at one end | - |
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| (noun) a particular aspect of life or activity | Synonyms: sphere |
| (noun) a social group that forms part of the society or the economy | - |
| (noun) a portion of a military position | - |
| (noun) the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes | - |
| (noun) a plane figure bounded by two radii and the included arc of a circle | - |
| subsection | (noun) a section of a section; a part of a part; i.e., a part of something already divided | Synonyms: subdivision |
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| vasectomy | (noun) surgical procedure that removes all or part of the vas deferens (usually as a means of sterilization); is sometimes reversible | - |
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| vasosection | (noun) surgical incision into or division of the vas deferens | Synonyms: vasotomy |
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| venesection | (noun) surgical incision into a vein; used to treat hemochromatosis | Synonyms: phlebotomy |
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| vivisection | (noun) the act of operating on living animals (especially in scientific research) | - |
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| vivisectionist | (noun) a biologist who cuts open live animals for research | - |
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