Source : Webster's Revised Unabridged Dictionary (1913)

Leggy \Leg"gy\ (-g[y^]), a.
   Having long legs. --Thackeray.

Source : WordNet®

leggy
     adj 1: (of plants) having tall spindly stems [syn: {tall-growing}]
     2: having long legs [syn: {long-legged}, {long-shanked}]
     [also: {leggiest}, {leggier}]