Double, as a leaf

• Growing in pairs, botanically
• In pairs, botanically
• Growing in pairs

Wiktionary Word definitions in Wiktionary
a. (context botany English) double; growing in pairs or couples.

WordNet Word definitions in WordNet
adj. growing in two parts or in pairs; "binate leaves"

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Binate \Bi"nate\, a. [L. bini two and two.] (Bot.) Double; growing in pairs or couples. --Gray.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"double," 1807, from Latin bini "two by two, twofold, two apiece" (see binary ) + -ate (2).