Main Entry: tax·is

Pronunciation: \ˈtak-səs\

Function: noun

Inflected Form(s): plural tax·es \-ˌsēz\

Etymology: Greek, literally, arrangement, order, from tassein to arrange

Date: 1899

1 : reflex translational or orientational movement by a freely motile and usually simple organism in relation to a source of stimulation (as a light or a temperature or chemical gradient)
2 : a reflex reaction involving a taxis