Meanings

vector construction

structural color

chemical structural formula

ornamental doorway (in the raised area of a shoin-style reception suite)

immune system

Warsaw Treaty Organization

lever mechanism (in bicycle brakes, metal shears, etc.)

poststructuralism

defence mechanism

dysarthria

constructor

Japan Housing Finance Agency

worry

crystal structure

nice person

nice person

nucleon structure

outermost enclosure of a castle or fortress (including the town around it)

tectonic earthquake

geological structure