Desolated is a door when no guests come knocking. Lit. To hang a net on the door and use it to catch sparrows (as no guests ever come).

seldom lending or showing something precious because one values it

crest (often of a family)

Japanese unit of weight (1/1000 of a kan)

astronomy

practical question (problem)

Montreal (the largest city in Quebec, Canada) / Montreal (an island in Quebec, Canada, the site of the city of Montreal) / Montreal (a river in Algoma district and Sudbury district, Ontario, Canada)

observatory (place where celestial bodies are observed)

phrenology

(historical) mathematics