Strain
Strain may refer to:

Science and technology
Strain (biology), variants of plants, viruses or bacteria; or an inbred animal used for experimental purposes
Strain (chemistry), a chemical stress of a molecule
Strain (injury), an injury to a muscle (tear in tendon) in which the muscle fibers tear as a result of over-stretching
Strain (mechanics), a geometrical measure of deformation representing the relative displacement between particles in a material body
Filtration, separating solids from fluids (liquids or gases) by interposing a strainer, a medium through which only the fluid can pass
Percolation, the movement and filtering of fluids through porous materials
Psychological stress

Other uses
straining, in cooking, the separation of liquid from solids using a strainer or sieve.
straining (puréeing), the process of making a mash or purée by forcing through a sieve, rather than using a power blender. Cf. ricing (cooking)
strain (bridge), the indication of either the trump suit or notrump in a bid made in the game of contract bridge; also called a denomination

Proper names
Strain (surname)

Arts and media
Strain (manga), a 1996 manga written by Yoshiyuki Okamura, and illustrated by Ryoichi Ikegami
Strain (music), a series of musical phrases that create a distinct melody of a piece
Strain (album), a 2004 album by Flesh Field
Strain: Strategic Armored Infantry, a 2006 anime
Strain (film), a 2020 Nigerian drama

Places
Strain, Arkansas, an unincorporated community in Richland Township of the Southern United States
Strain, Missouri, an unincorporated community in Franklin County, Missouri, USA

See also
Overwork
S Train (disambiguation)
Strain theory (disambiguation)
Strainer, a type of sieve used to separate solids from liquids, e.g. in cooking
The Strain (disambiguation)
Stressor