from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective having three lips
Sorry, no etymologies found.
- Internal side-cutting tool (boring tool) or spiral-fluted counterbore (three-lipped twist drill) to produce the hole with machining allowance for reaming.
Being a three-lipped tool, it is used for expanding holes (preparation) for reaming.
- three-lipped twist drill (spiral countersink) - head counterbore or counterboring tool with pilot