2. a lightweight protective helmet (plastic or metal) worn by construction workers; [syn: hard hat, tin hat, safety hat]
WordNet (r) 3.0 (2006):
hard hat
n 1: a worker skilled in building offices or dwellings etc.
[syn: construction worker, hard hat]
2: a lightweight protective helmet (plastic or metal) worn by
construction workers [syn: hard hat, tin hat, safety
hat]