taxis

n. cab, taxicab

A taxis (plural taxes, ) is an innate behavioural response by an organism to a directional stimulus. A taxis differs from a tropism (turning response, often growth towards or away from a stimulus) in that the organism has motility and demonstrates guided movement towards or away from the stimulus . It also differs from a kinesis, a non-directional change in activity in response to a stimulus that results in the illusion of directed motion due to different rates of activity depending on stimulus intensity.
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Taxis /tax·is/ [Gr.] 1. an orientation movement of a motile organism in response to a stimulus, either toward or away from the source of the [more]Taxis - Community and Resources

Noun
1. a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism
(hypernym) reaction, response
(hyponym) chemotaxis
2. the surgical procedure of manually restoring a displaced body part
(hypernym) operation, surgery, surgical operation, surgical procedure, surgical process

Noun
1. a car driven by a person whose job is to take passengers where they want to go in exchange for money
(synonym) cab, hack, taxicab
(hypernym) car, auto, automobile, machine, motorcar
(hyponym) gypsy cab
(member-holonym) fleet
Verb
1. travel slowly; "The plane taxied down the runway"
(hypernym) travel, go, move, locomote
2. ride in a taxicab
(hypernym) ride
(derivation) cab, hack, taxicab

n. cab, taxi, taxicab, automobile which transports passengers for a fee