light-horseman

noun3

1. •
   A soldier who serves in the light cavalry.
2. •
   (US, no longer used) A member of species Chaetodipterus faber of West Indian fish with a high dorsal fin and brilliant colours.
3. •
   (Australia, no longer used) A member of species Pagrus auratus of snapper, whose skull is shaped in the front like a cap worn by light-horsemen.