'Titrant' is the compound in the titration buret, mostly its concentration is exactly known.
'Titrand' is the substance which is being analysed in the titration.
Added:
A typical titration begins with a beaker or Erlenmeyer flask containing a precise volume of the titrand (or analyte) and a small amount of indicator placed underneath a calibrated burette or chemistry pipetting syringe containing the (or reactant).
When the endpoint of the reaction is reached, the volume of titrant (or reactant) consumed is measured and used to calculate the concentration of analyte, using:
Ca = Cr . Vr . M / Vawhere M is the mole ratio of the analyte and reactant from the balanced chemical equation.