trace
/ˈtrās/
noun
a minute and often barely detectable amount or indication
an amount of a chemical constituent not always quantitatively determinable because of minuteness
a mark or line left by something that has passed; also : footprint
a trace of a smile
verb
delineate, sketch
to form (letters, figures, etc.) carefully or painstakingly
to copy (something, such as a drawing) by following the lines or letters as seen through a transparent superimposed sheet
noun
either of two straps, chains, or lines of a harness for attaching a draft animal to something (such as a vehicle) to be drawn
leader
one or more vascular bundles supplying a leaf or twig