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phototaxis

phototaxis


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Phototaxis  \Pho`to*tax"is\,  Phototaxy  \Pho"to*tax`y\,  n.  [NL. 
  phototaxis;  photo-  +  Gr  ?  an  arranging.]  (Biol.) 
  The  influence  of  light  on  the  movements  of  low  organisms,  as 
  various  infusorians,  the  zo["o]spores  of  certain  alg[ae], 
  etc.;  also  the  tendency  to  follow  definite  directions  of 
  motion  or  assume  definite  positions  under  such  influence.  If 
  the  migration  is  toward  the  source  of  light,  it  is  termed 
 
  {positive  phototaxis};  if  away  from  the  light, 
 
  {negative  phototaxis}.  --  {Pho`to*tac"tic},  a.  -- 
  {Pho`to*tac"tic*al*ly},  adv