"Stroke" is an English word with several unrelated meanings across medicine, mechanics, the arts, sports and everyday speech. This disambiguation summarizes the principal senses so a reader can distinguish the medical condition from actions or technical terms that share the same name.
Common senses
- Medical: a sudden neurological injury caused by interruption of blood supply to the brain (also called cerebrovascular accident).
- Mechanical: a single travel distance of a piston or the phases of a reciprocating engine (e.g., four-stroke engine).
- Art and writing: a mark made by a brush, pen or stylus; the visible line or motion.
- Sports: distinct techniques or single movements in swimming, rowing, golf, tennis and similar activities.
- Everyday actions and idioms: to stroke an animal (pet); to stroke someone's ego (praise); a blow or caress.
Medical meaning and importance
In medicine, a stroke refers to acute damage to brain tissue from either blockage of blood flow (ischemic stroke) or bleeding inside the brain (hemorrhagic stroke). Symptoms often start suddenly and may include weakness on one side of the body, difficulty speaking or understanding speech, loss of vision, severe headache or imbalance. Prompt medical attention is critical because some treatments are time-sensitive.
Mechanical and technical senses
In engineering, a stroke is the linear travel of a piston or the motion associated with a crankshaft rotation. Internal combustion engines are commonly described by their number of strokes per cycle (two-stroke, four-stroke), which determines intake, compression, power and exhaust phases. In digital graphics, a "stroke" is an outline applied to shapes or paths, distinct from a filled area.
Art, writing and sport
Artists and calligraphers use the term to describe individual brush or pen marks that combine to form an image or letter. In sports, "stroke" can mean a technique (freestyle stroke, breaststroke) or a single execution of movement (rowing stroke, a golf or tennis stroke), often emphasizing form, timing and power.
Other uses and distinctions
Colloquially, to stroke can mean to caress an animal or person, or to flatter someone figuratively. Related terms include "keystroke" (a single key press) and "transient ischemic attack" (TIA), sometimes called a "mini-stroke" when symptoms are temporary—however TIA differs from a completed stroke because it does not cause lasting brain tissue damage. Context usually makes clear which sense is intended.