Gōat'-sück'er, n.

noun

n. (Ornith.) A nocturnal swallow, something like the owl in appearance (Caprimulgus Europæus);—so called from the mistaken notion that it sucks goats;—called also fern-owl.

An illustration of a goat-sucker perched on a branch with its beak open.
Goat-sucker (Caprimulgus Europæus.)