thornback

noun

1.
an elderly unmarried woman
old maid spinster
2.
primitive tropical bottom-dwelling ray with a guitar-shaped body
whalefish guitarfish
3.
large ray found along eastern coast of North America
cow-nosed ray cownose ray Rhinoptera bonasus
4.
most plentiful skate in North American inshore waters in summer; to 21 inches
little skate Raja erinacea