tick 3 
(tĭk)
(tĭk)n.
1.
a. A cloth case for a mattress or pillow.
b. A light mattress without inner springs.
2. Ticking.
[Middle English tikke, probably from Middle Dutch tīke, ultimately from Latin thēca, receptacle, from Greek thēkē; see dhē- in the Appendix of Indo-European roots.]