fish scale

Short definition from Wiktionary

Noun

1. 1
   Alternative form of fishscale (“high-quality cocaine”).
2. 2
   An early 5 cent coin of Canada, an early Canadian nickel.
3. 3
   Alternative form of fishscale: uncut cocaine.

Adjective

1. 1
   Usually of roofing tiles or shingles, shaped and laid in such a way that they resemble the scales of a fish.