1. (noun) Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century)

• hero
• hero of alexandria

1. (noun) grey or white wading bird with long neck and long legs and (usually) long bill

• ardea herodius
• great blue heron
• ardea occidentalis
• great white heron
• bittern
• boat-billed heron
• boatbill
• broadbill
• cochlearius cochlearius
• egret
• egretta caerulea
• little blue heron
• night heron
• night raven

1. (noun) grey or white wading bird with long neck and long legs and (usually) long bill

• ardeidae
• family ardeidae

1. (noun) grey or white wading bird with long neck and long legs and (usually) long bill

• wader
• wading bird