1) Arthropod genus 2) Genus megachile 
The genus Megachile is a cosmopolitan group of solitary bees, often called leafcutter bees. While other genera within the family Megachilidae may chew leaves or petals into fragments to build their nests, certain species within Megachile neatly cut pieces of leaves or petals, hence their common name. This is one of the largest genera of bees, with...
• (n.) A leaf-cutting bee of the genus Megachilus. See Leaf cutter, under Leaf.
Meg'a·chile noun [ Mega- + Greek ... lip.] (Zoology) A leaf-cutting bee of the genus Megachilus . See Leaf cutter , under Leaf . 
[n] - type genus of the Megachilidae: leaf-cutting bees
genus Megachile noun type genus of the Megachilidae: leaf-cutting bees