# Diagram vs. Diaphragm: What's the Difference?

## Diagram and Diaphragm Definitions

#### Diagram

A plan, sketch, drawing, or outline designed to demonstrate or explain how something works or to clarify the relationship between the parts of a whole.

#### Diaphragm

(Anatomy) A muscular membranous partition separating the abdominal and thoracic cavities and functioning in respiration. Also called midriff.

#### Diagram

(Mathematics) A graphic representation of an algebraic or geometric relationship.

#### Diaphragm

A membranous part that divides or separates.

#### Diagram

A chart or graph.

#### Diaphragm

A thin disk, especially in a microphone or telephone receiver, that vibrates in response to sound waves to produce electric signals, or that vibrates in response to electric signals to produce sound waves.

#### Diagram

To indicate or represent by or as if by a diagram.

#### Diaphragm

A contraceptive device consisting of a thin flexible disk, usually made of rubber, that is designed to cover the uterine cervix to prevent the entry of sperm during sexual intercourse.

#### Diagram

A plan, drawing, sketch or outline to show how something works, or show the relationships between the parts of a whole.
Electrical diagrams show device interconnections.

#### Diaphragm

A disk having a fixed or variable opening used to restrict the amount of light traversing a lens or optical system.

#### Diagram

A graph or chart.

#### Diaphragm

(anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.

#### Diagram

(category theory) A functor from an index category to another category. The objects and morphisms of the index category need not have any internal substance, but rather merely outline the connective structure of at least some part of the diagram's codomain. If the index category is J and the codomain is C, then the diagram is said to be "of type J in C".

#### Diaphragm

(anatomy) Any of various membranes or sheets of muscle or ligament which separate one cavity from another.

#### Diagram

(transitive) To represent or indicate something using a diagram.

#### Diaphragm

A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.

#### Diagram

(UK) To schedule the operations of a locomotive or train according to a diagram.

#### Diaphragm

(mechanics) A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber as the difference in the pressure in the chambers varies.

#### Diagram

A figure or drawing made to illustrate a statement, or facilitate a demonstration; a plan.

#### Diaphragm

(acoustics) In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.

#### Diagram

Any simple drawing made for mathematical or scientific purposes, or to assist a verbal explanation which refers to it; a mechanical drawing, as distinguished from an artistical one.

#### Diaphragm

A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.

#### Diagram

To put into the form of a diagram.

#### Diaphragm

(chemistry) A permeable or semipermeable membrane.

#### Diagram

A drawing intended to explain how something works; a drawing showing the relation between the parts

#### Diaphragm

(construction) A floor slab, metal wall panel, roof panel or the like, having a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.

#### Diagram

Make a schematic or technical drawing of that shows how things work or how they are constructed

#### Diaphragm

To reduce lens aperture using an optical diaphragm.

#### Diaphragm

To act as a diaphragm, for example by vibrating.

#### Diaphragm

A dividing membrane or thin partition, commonly with an opening through it.

#### Diaphragm

The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.

#### Diaphragm

A calcareous plate which divides the cavity of certain shells into two parts.

#### Diaphragm

A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.

#### Diaphragm

A partition in any compartment, for various purposes.

#### Diaphragm

A mechanical device in a camera that controls size of aperture of the lens;
The new cameras adjust the diaphragm automatically

#### Diaphragm

(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration

#### Diaphragm

A contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix

#### Diaphragm

Electro-acoustic transducer that vibrates to receive or produce sound waves