quatercentennial
— Noun
– English
~ the 400th anniversary (or the celebration of it)
quatern
— Noun
– English
~ the cardinal number that is the sum of three and one
quaternary
— Noun
– English
~ the cardinal number that is the sum of three and one
quaternary
— Noun
– English
~ last 2 million years
quaternary ammonium compound
— Noun
– English
~ a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface-active agents, disinfectants, and in drugs