/mud"lahrk'/ , n.
1. Chiefly Brit. a person who gains a livelihood by searching for iron, coal, old ropes, etc., in mud or low tide.
2. Chiefly Brit. Informal. a street urchin.
3. either of two black and white birds, Grallina cyanoleuca, of Australia, or G. bruijni, of New Guinea, that builds a large, mud nest.
v.i.
4. to grub or play in mud.
[ 1790-1800; MUD + LARK 1 ]