From The Collaborative International Dictionary of English v.0.48 [gcide]:
Succulent \Suc"cu*lent\, a. [L. succulentus, suculentus, fr.
succus, sucus, juice; perhaps akin to E. suck: cf. F.
succulent.]
Full of juice; juicy.
[1913 Webster]
Succulent plants (Bot.), plants which have soft and juicy
leaves or stems, as the houseleek, the live forever, and
the species of Mesembryanthemum.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
succulent
adj 1: full of juice; "lush fruits"; "succulent roast beef";
"succulent plants with thick fleshy leaves" [syn: lush,
succulent]
n 1: a plant adapted to arid conditions and characterized by
fleshy water-storing tissues that act as water reservoirs