stro·phoid (str  foid )n. The curve traced out by points P and P which lie on lines through a fixed point A where the midpoint M of PP is on a fixed line and the absolute value  PM = the absolute value PM = the absolute value MO, where O is the projection of A onto that fixed line.[Greek strophos, twisted cord (from strephein, to turn; see streb(h)- in Indo-European roots) + -oid.] |   graph of the equation y2 = x2(a + x)/(a - x) |
| strophoid (strfoid) The curve traced out by points P and P which lie on lines through a fixed point A where the midpoint M of PP is on a fixed line and the absolute value PM equals the absolute value PM equals the absolute value MO, where O is the projection of A onto that fixed line. |  graph of the equation y2= x2(a + x)/(a - x) |
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