The Collaborative International Dictionary of English v.0.48:
Crosslet \Cross"let\ (-lEt), n. [Dim. of cross.] 1. A small cross. --Spenser. [1913 Webster] 2. [Cf. OF. croisel crucible, and E. Cresset.] A crucible. [Obs.] --Chaucer. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Crosslet \Cross"let\, a. (Her.) Crossed again; -- said of a cross the arms of which are crossed. SeeCross-crosslet. [1913 Webster]