FLATTENING
Verb
flattening
present participle of flatten
Noun
flattening (plural flattenings)
The act, or the result of making something flat of flatter
A flattened part of something
The Earth is a sphere that has flattenings at the poles.
Source: Wiktionary
FLATTEN
Flat"ten, v. t. [imp. & p. p. Flattened; p. pr. & vb. n. Flattening.]
Etym: [From Flat, a.]
1. To reduce to an even surface or one approaching evenness; to make
flat; to level; to make plane.
2. To throw down; to bring to the ground; to prostrate; hence, to
depress; to deject; to dispirit.
3. To make vapid or insipid; to render stale.
4. (Mus.)
Definition: To lower the pitch of; to cause to sound less sharp; to let
fall from the pitch. To flatten a sail (Naut.), to set it more nearly
fore-and-aft of the vessel.
– Flattening oven, in glass making, a heated chamber in which split
glass cylinders are flattened for window glass.
Flat"ten, v. i.
Definition: To become or grow flat, even, depressed dull, vapid,
spiritless, or depressed below pitch.
Source: Webster’s Unabridged Dictionary 1913 Edition