troweling machine
1helicopter — 1. noun /ˈheliˌkoptə(ɹ),ˈhɛl.iˌkɒp.tə(ɹ),ˈhɛl.ɪˌkɒp.tə(ɹ),ˈhɛlɨˌkɑptɚ/ a) An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and having a smaller… …
2Excavation (archaeology) — The term archaeological excavation has a double meaning.# Excavation is the best known and most commonly used within the science of archaeology. In this sense it is the exposure, processing and recording of archaeological remains. # The term is… …
