Robber \Rob"ber\, n. One who robs; in law, one who feloniously takes goods or money from the person of another by violence or by putting him in fear.

Some roving robber calling to his fellows. --Milton.

Syn: Thief; depredator; despoiler; plunderer; pillager; rifler; brigang; freebooter; pirate. See Thief.

Robber crab. (Zo["o]l.)
   (a) A purse crab.
   (b) Any hermit crab.

Robber fly. (Zo["o]l.) Same as Hornet fly, under Hornet.

Robber gull (Zo["o]l.), a jager gull.

Source: Webster's Revised Unabridged Dictionary (1913)