The Collaborative International Dictionary of English v.0.48:
Paillasse \Pail*lasse"\ (?; F. ?), n. [F., fr. paille straw. See Pallet a bed.] An under bed or mattress of straw. [Written also palliasse.] [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Palliasse \Pal*liasse"\, n. See Paillasse. [1913 Webster]WordNet (r) 3.0 (2006):
palliasse n 1: mattress consisting of a thin pad filled with straw or sawdust [syn: paillasse, palliasse]