the nature or most important quality (of something)

heart, significance

the soft; fatty substance that fills the inside of bones

heart, essence

the whole universe and every created thing; the qualities and characteristics, physical, mental and spiritual, which belong to a person or animal from birth; sort; kind

character, disposition

a perfect example

essence, core

the part of a plant, tree etc in the ground and which takes water and food from the soil

base, core

the arrangement of the threads in a cloth; the arrangement of the parts that make up something

characteristics of a surface