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Webster 1913 Edition

adv.

In a transverse manner.

adv.

transvers'ly. In a cross direction; as, to cut a thing transversely.

At Stonehenge, the stones lie transversely upon each other.

transversely ‎(not comparable)

In a transverse manner.
- 1895, H. G. Wells, The Time Machine Chapter X
  Exploring, I found another short gallery running transversely to the first.

In a transverse manner

transversely in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913