The Collaborative International Dictionary
Esculent swallow
Esculent \Es"cu*lent\, a. [L. esculentus, fr. escare to eat, fr. esca food, fr. edere to eat: cf. F. esculent. See Eat.] Suitable to be used by man for food; eatable; edible; as, esculent plants; esculent fish.
Esculent grain for food.
--Sir W.
Jones.
Esculent swallow (Zo["o]l.), the swallow which makes the edible bird's-nest. See Edible bird's-nest, under Edible.
Wiktionary
esculent swallow
n. A kind of swallow that makes an edible nest.