Quince n. : The fruit of a shrub (Cydonia vulgaris) belonging to the same tribe as the apple. It somewhat resembles an apple, but differs in having many seeds in each carpel. It has hard flesh of high flavor, but very acid, and is largely used for marmalade, jelly, and preserves.

Quince n. : a quince tree or shrub.

Example:
How early should people plan their Quince?

Taxonomy
fruit, quince tree, apple, Cydonia oblonga, flowering quinces, Marmalade, free encyclopedia, Cultivation, poem, flowers, genus Cydonia, fruit can, apple sauce, Sugars, pear, recipes, paste, the seeds.

Defination from the web:
... Quince is used as a food plant by the larvae of some Lepidoptera species including Brown-tail, Bucculatrix bechsteinella, Bucculatrix ...