The word 'teardrop' is a transparent compound formed from two native English words of ancient Germanic lineage. 'Tear' originates from the Proto-Germanic tahr-, tagr-, which itself derives from the Proto-Indo-European dakru-, a root widely shared across languages to express the concept of weeping. 'Drop' stems from Proto-Germanic drup-, related to the verb 'to drip', and can be traced back to the PIE root dhreu- meaning 'to fall, flow, drip'. The compound logically and literally describes a 'drop of tear', a small, discrete unit of the saline liquid produced by the lacrimal glands. Over time, its meaning extended metaphorically to describe any object with the characteristic falling or pear-shaped form of a liquid droplet, demonstrating how a concrete, physiological phenomenon provides a template for describing abstract shapes.

Structure: tear (liquid from eye) + drop (small mass of liquid) - tear: From Old English tēar, tæhher, of Proto-Germanic origin; related to the act of weeping. The functional role is the core noun denoting the specific liquid. - drop: From Old English dropa, of Proto-Germanic origin; related to a small spherical mass of a liquid. The functional role is a noun specifying the form or unit of the substance.