labor improbus /lāˈbör im-prōˈbəs or laˈbor im-proˈbŭs/ (Latin)

Persistent, dogged labour

• oil palms
• oil pan
• oil pans
• oil paper
• oil platform
• oil platforms
• oil press
• oil presses
• oil-rich
• oil rig
• oil rigs
• oils
• oil sand
• oilseed
• oilseed rape
• oilseeds
• oil shale
• oil silk
• oilskin
• oilskins
• oil slick
• oil slicks
• oil someone's palm
• oilstone
• oilstones