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trochoid

trochoid


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Trochoid  \Tro"choid\,  n.  [Gr.  ?  a  wheel  +  -oid;  cf  F. 
  trocho["i]de.  See  {Troche}.]  (Geom.) 
  The  curve  described  by  any  point  in  a  wheel  rolling  on  a 
  line  a  cycloid;  a  roulette;  in  general,  the  curve  described 
  by  any  point  fixedly  connected  with  a  moving  curve  while  the 
  moving  curve  rolls  without  slipping  on  a  second  fixed  curve, 
  the  curves  all  being  in  one  plane.  Cycloids,  epicycloids, 
  hypocycloids,  cardioids,  etc.,  are  all  trochoids. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Trochoid  \Tro"choid\,  a. 
  1.  (Anat.)  Admitting  of  rotation  on  an  axis;  --  sometimes 
  applied  to  a  pivot  joint  like  that  between  the  atlas  and 
  axis  in  the  vertebral  column. 
 
  2.  (Zo["o]l.)  Top-shaped;  having  a  flat  base  and  conical 
  spire;  --  said  of  certain  shells. 
 
  3.  (Zo["o]l.)  Of  or  pertaining  to  the  genus  Trochus  or  family 
  {Trochid[ae]}.