Rib \Rib\, v. t. [imp. & p. p. Ribbed; p. pr. & vb. n. Ribbing.]

1. To furnish with ribs; to form with rising lines and channels; as, to rib cloth.

2. To inclose, as with ribs, and protect; to shut in.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Ribbed \Ribbed\, a.

1. Furnished or formed with ribs; as, a ribbed cylinder; ribbed cloth.

2. (Mining) Intercalated with slate; -- said of a seam of coal. --Raymond.

Source: Webster's Revised Unabridged Dictionary (1913)