Webster's English Dictionary

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solidus

sol.i.dus \'sa:l-*d-*s\ \-*-.di-, -.de-\ n or sol.i.di [ME, fr. LL, fr. L, 
   solid] [ML, shilling, fr. LL; fr. its use as a symbol for shillings] pl  1: 
   an ancient Roman gold coin introduced by Constantine and used to the fal l 
   of the Byzantine Empire 2: DIAGONAL