1. the quality or state of being feathery or having feather-like structures; the presence of plumes or feathered appendages.
Usage: technical or scientific term; often used in biology and zoology

Examples

• The plumosity of the bird's wings allowed it to glide smoothly through the air.
• Scientists studied the plumosity of the insect's antennae under a microscope.
• The feather's plumosity made it ideal for insulation.
• The plumosity of certain plant structures helps them disperse seeds on the wind.