[See STEP-. Cf. Du. stiefzuster, MHG., mod.G. stiefschwester, Sw. styfsyster, Da. stifsøster.] A daughter of one’s stepfather or stepmother.

1

c. 1440.  Promp. Parv., 474/1. Stepsystyr.

2

1530.  Palsgr., 276/1. Step sustre, belle seur.

3

1828.  in Webster.

4

1868.  [see STEPBROTHER].

5

1883.  Miss M. Betham-Edwards, Disarmed, xxx. Throwing his arms round his step-sister’s neck.

6

1910.  C. N. & A. M. Williamson, Love & Spy, I. i. 10. Di and I are only step-sisters.

7