Strain is all the descendents of a pure culture; usually a succession of cultures derived from an initial colony.

Webster Dictionary Meaning

1. Strain
- To draw with force; to extend with great effort; to stretch; as, to strain a rope; to strain the shrouds of a ship; to strain the cords of a musical instrument.
- To act upon, in any way, so as to cause change of form or volume, as forces on a beam to bend it.
- To exert to the utmost; to ply vigorously.
- To stretch beyond its proper limit; to do violence to, in the matter of intent or meaning; as, to strain the law in order to convict an accused person.
- To injure by drawing, stretching, or the exertion of force; as, the gale strained the timbers of the ship.
- To injure in the muscles or joints by causing to make too strong an effort; to harm by overexertion; to sprain; as, to strain a horse by overloading; to strain the wrist; to strain a muscle.
- To squeeze; to press closely.
- To make uneasy or unnatural; to produce with apparent effort; to force; to constrain.
- To urge with importunity; to press; as, to strain a petition or invitation.
- To press, or cause to pass, through a strainer, as through a screen, a cloth, or some porous substance; to purify, or separate from extraneous or solid matter, by filtration; to filter; as, to strain milk through cloth.
2. Strain
- Race; stock; generation; descent; family.
- Hereditary character, quality, or disposition.
- Rank; a sort.
- The act of straining, or the state of being strained.
- A violent effort; an excessive and hurtful exertion or tension, as of the muscles; as, he lifted the weight with a strain; the strain upon a ship's rigging in a gale; also, the hurt or injury resulting; a sprain.
- A change of form or dimensions of a solid or liquid mass, produced by a stress.
- A portion of music divided off by a double bar; a complete musical period or sentence; a movement, or any rounded subdivision of a movement.
- Any sustained note or movement; a song; a distinct portion of an ode or other poem; also, the pervading note, or burden, of a song, poem, oration, book, etc.; theme; motive; manner; style; also, a course of action or conduct; as, he spoke in a noble strain; there was a strain of woe in his story; a strain of trickery appears in his career.
- Turn; tendency; inborn disposition. Cf. 1st Strain.
3. Strain
- To make violent efforts.
- To percolate; to be filtered; as, water straining through a sandy soil.
Category: Microbiology
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