a.1.(Bot.) Concealed within the base of the petiole, as the leaf buds of the plane tree.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Subpetiolar process glossy, ranging from black to reddish-brown; projecting posteriorly, roughly rectangular with rounded edges; similar to worker.
Subpetiolar process produced as anterior spine directed forward, spine normally not visible in mounted specimens.