Mining. a crossing of two passages, as airways, dug at the same level so that one descends to pass beneath the other without any opening into it. Compare overcast(def. 9).
2.
Meteorology. an overcast layer of clouds viewed from above.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.