(ˈ)kwä|drəplə̇t, kwəˈd-, -rüp-, ˈkwäd- sometimes ˈkwä_drəp- or (ˈ)kwȯ|- or ˈkwȯd-; usu -ə̇d.+V noun
( -s )
Etymology: from quadruple (III) , after such pairs as English double : doublet
1.
a. : one of four children or offspring born at one birth
b. quadruplets plural : a group of four offspring born at one birth
2. : a combination of four of a kind
3. : a group of four musical notes to be performed in the time ordinarily given to three of the same kind
4. : a bicycle for four riders