Dragon's head Meaning, Definition & Usage

  1. noun American herb having sharply serrate lanceolate leaves and spikes of blue to violet flowers
    dragonhead; Dracocephalum parviflorum.

WordNet

Definitions
  1. . (a) (Bot.) A plant of several species of the genus Dracocephalum. They are perennial herbs closely allied to the common catnip. (b) (Astron.) The ascending node of a planet, indicated, chiefly in almanacs, by the symbol . The deviation from the ecliptic made by a planet in passing from one node to the other seems, according to the fancy of some, to make a figure like that of a dragon, whose belly is where there is the greatest latitude; the intersections representing the head and tail; from which resemblance the denomination arises. Encyc. Brit.

Webster 1913