signal crayfish
noun
A freshwater crayfish, Pacifastacus leniusculus (family Astacidae), with a bright patch on the underside of each claw, native to the western United States and introduced in Europe and Japan, where it now threatens native wildlife.
Origin
1980s; earliest use found in Ambio. After Swedish signalkräfta.
- black plum
- black pod
- blackpoll
- blackpoll warbler
- Blackpool
- black pope
- black poplar
- black poppy
- black pot
- black powder
- Black Power
- black power salute
- Black Prince
- black print
- black propaganda
- black Protestant
- black pudding
- black quarter
- black radish
- black rain
- black raspberry
- black rat
- black rat snake
- black redstart
- black rent