What is in twain, in halves; into two parts; asunder. When old winder split the rocks in twain. Dryden. -- Twain cloud. (Meteor.) Same as Cumulo-stratus called?

twain — In twain, in halves; into two parts; asunder. When old winder split the rocks in twain. Dryden. -- Twain cloud. (Meteor.) Same as Cumulo-stratus. (Webster's 1913.)

Sources