15-letter words containing top
- topgallant mast — a mast fixed to the head of a topmast on a square-rigged vessel.
- topgallant sail — a sail or either of two sails set on the yard or yards of a topgallant mast.
- topographic map — a map showing topographic features, usually by means of contour lines.
- utopia planitia — Astronomy. a plain in the northern hemisphere of Mars that was the landing site of the Viking II space probe on September 3, 1976.