The difference between Buttock line and Section

Buttock line as a noun (aviation, ship-building):

A curve indicating the shape of an airfoil or nautical equivalent in a vertical plane parallel to the longitudinal axis of the craft or vessel.

Section as a noun:

A cutting; a part cut out from the rest of something.

Section as a noun (music):

A part, piece, subdivision of anything. A group of instruments in an orchestra.

Section as a noun:

A part of a document.

Section as a noun:

An act or instance of cutting.

Section as a noun (aviation):

A cross-section (image that shows an object as if cut along a plane). A cross-section perpendicular the longitudinal axis of an aircraft in flight.

Section as a noun (surgery):

An incision or the act of making an incision.

Section as a noun (surgery, specifically, colloquial):

Section as a noun (sciences):

A thin slice of material prepared as a specimen for research.

Section as a noun (botany):

A taxonomic rank below the genus (and subgenus if present), but above the species.

Section as a noun (zoology):

An informal taxonomic rank below the order ranks and above the family ranks.

Section as a noun (military):

A group of 10-15 soldiers led by a non-commissioned officer and forming part of a platoon.

Section as a noun (category theory):

A right inverse.

Section as a noun (NZ):

A piece of residential land; a plot.

Section as a noun (Canadian):

A one-mile square area of land, defined by a government survey.

Section as a noun (geology):

A sequence of rock layers.

Section as a verb:

To cut, divide or separate into pieces.

Section as a verb (British):

To commit (a person, to a hospital, with or without their consent), as for mental health reasons.

Section as a verb:

To perform a cesarean section on (someone).