The term is a modern compound adjective formed by combining the noun 'torpedo' with the participial adjective 'shaped'. 'Torpedo' entered English in the early 16th century from Latin, where it initially referred to the electric ray, a fish that delivers a numbing shock, derived from the verb torpere (to be stiff or numb). The name was later applied to the underwater explosive weapon due to its similar cylindrical form and stunning effect. The morpheme 'shaped' originates from Old English, related to the concept of creation and form. Thus, 'torpedo-shaped' logically describes an object whose form mimics the sleek, elongated, and rounded profile characteristic of the naval weapon, transferring the visual properties of the man-made object to describe other entities.

Structure: torpedo + shaped torpedo: From Latin torpedo (numbness, electric ray), originally from torpere (to be stiff or numb). In this compound, it functions as a noun used attributively to specify the type of shape. shaped: From Old English gesceap (form, creation), related to scieppan (to create). In this compound, it functions as a past participle/adjectival suffix meaning "having the form of".