These birds are the size of a turkey-cock; but they are lanker and more angular in form.
Dicky grew slighter and lanker, dark about the eyes, and weaker.
They grew lanker and lanker every day, and we soon saw that they would not be able to stand it in the long run.
Old English hlanc "loose and empty, slender, flaccid," from Proto-Germanic *khlankaz, perhaps from a root meaning "flexible" (cf. German lenken "to bend, turn aside," Old Norse hlykkr "bend, noose, loop"), from PIE root *kleng- "to bend, turn" (see link (n.)). "Some examples may be long adj. with unvoicing of g" ["Middle English Dictionary"]