20-letter words containing i, s, o, b, u
- tobacco mosaic virus — a retrovirus causing mosaic disease in members of the nightshade family. Abbreviation: TMV.
- tropical disturbance — a very weak, or incipient, tropical cyclone.
- twiddle one's thumbs — to turn about or play with lightly or idly, especially with the fingers; twirl.
- white bush (scallop) — a variety of summer squash having a saucer-shaped white fruit, scalloped around the edges
- wilson cloud chamber — cloud chamber.