very thin, as thin as a hair
A fishing line made from hair.
The line along one's forehead where hair starts growing.
A very thin line in writing, drawing, or typography.
A very thin fissure.
Without ornamentation; plain.
Consisting of a single individual or zooid; not compound.
Consisting of one single substance; uncompounded.
Undistinguished in social condition; of no special rank.
Free from duplicity; guileless, innocent, straightforward.
Of a group: having no normal subgroup.
Homogenous.
Feeble-minded; foolish.
Using steam only once in its cylinders, in contrast to a compound engine, where steam is used more than once in high-pressure and low-pressure cylinders.
Not compound, but possibly lobed.
Uncomplicated; taken by itself, with nothing added.
Part of the apparatus for raising the heddles of a drawloom.
A herbal preparation made from one plant, as opposed to something made from more than one plant.
A feast which is not a double or a semidouble.
A drawloom.
A simple or atomic proposition.