simple past

(pathology) A viral disease caused by Human herpesvirus 1 or Human herpesvirus 2 in genus Simplexvirus.

Clearly, without any doubt or complexity.

plural of simple machine

Any of the viruses in the Simplexvirus genus responsible for herpes simplex in humans.

One who simpers.

plural of simperer

In a simpering way.

(physics) A hypothetical pendulum consisting of a weight suspended by a weightless string.

(finance) interest paid only on the principal.