plural of sci

(intransitive) To commit an error, make a mistake. / (transitive) To cause (someone) to commit an error, trick into a mistake. / (intransitive) To fall or stumble.

(archaic) Belonging to, or resembling, an abyss; unfathomable. / (geography) Of or belonging to the ocean depths, especially below 2000 metres (6500 ft): abyssal zone.

plural of cold-back