See Also: tractrix(medicine)
tractrix(dictionary)

tintinnid (iou) and tractrix (medicine)


tintinnid (iou)



tintinnid noun. M20.
[Latin Tintinnidae (see below), formed as TINTINNABULUM: see -ID3.]
Zoology. A ciliate protozoan of the family Tintinnidae or the suborder Tintinnina, often distinguished by a bell-shaped chitinous test.

tractrix (medicine)


tractrix
<geometry> A curve such that the part of the tangent between the point of tangency and a given straight line is constant; so called because it was conceived as described by the motion of one end of a tangent line as the Other end was drawn along the given line.