coefficient of expansion: the fractional change in length or area or volume per unit change in temperature at a given constant pressure
coefficient: a constant number that serves as a measure of some property or characteristic
ascomycota: a large subdivision of Eumycota including Hemiascomycetes and Plectomycetes and Pyrenomycetes and Discomycetes; sac fungi; in some classification systems considered a division of the kingdom Fungi