S: (n) straight line (a line traced by a point traveling in a constant direction; a line of zero curvature) "the shortest distance between two points is a straight line"
S: (n) line (a length (straight or curved) without breadth or thickness; the trace of a moving point)
S: (n) shape, form (the spatial arrangement of something as distinct from its substance) "geometry is the mathematical science of shape"
S: (n) attribute (an abstraction belonging to or characteristic of an entity)
S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
S: (n) vector, transmitter (any agent (person or animal or microorganism) that carries and transmits a disease) "mosquitos are vectors of malaria and yellow fever"; "fleas are vectors of the plague"; "aphids are transmitters of plant diseases"; "when medical scientists talk about vectors they are usually talking about insects"
S: (n) vector ((genetics) a virus or other agent that is used to deliver DNA to a cell)
S: (n) virus ((virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein)
S: (n) arbovirus, arborvirus (a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis)
S: (n) bacteriophage, phage (a virus that is parasitic (reproduces itself) in bacteria) "phage uses the bacterium's machinery and energy to produce more phage until the bacterium is destroyed and phage is released to invade surrounding bacteria"
S: (n) plant virus (a plant pathogen that is a virus consisting of a single strand of RNA)