-ulus, -olus, -ulum, -ola

(Latin: suffix; little, small)

nodulus (s), noduli (pl)
1. A small node; especially, on the vermis of the cerebellum (narrow central part of the cerebellum between the two hemispheres).
2. A nodule or a small knot or node; used in anatomical nomenclature as a general term to designate a comparatively minute collection of tissue.
oculus (s), oculi (pl)
1. An eye; a leaf bud.
2. A round window, usually a small one.
3. An organ of vision.
4. An architectural feature that is round or eye-shaped; such as, a round window, a round opening at the top of a dome, or the central boss of a volute.
Volvulus (twisting) of the omentum.
orbiculus (s), orbiculi (pl)
1. Muscle surrounding an orifice; a sphincter muscle.
2. A small, disk-shaped structure.
sacculus (s), sacculi (pl)
1. A little sac; especially, a part of the membranous labyrinth of the ear.
2. The smaller of two membranous sacs in the vestibule of the inner ear.
3. A small sac of the membranous labyrinth occupying the spherical recess in the vestibule near the entrance of the scala vestibuli.
Senatus Populusque Romanus; SPQR (s) (noun) (no plural)
Translation: "The Senate and the People of Rome."

The initials SPQR, initials of or the abbreviation for Senatus Populusque Romanus, appeared on many ancient official standards (flags) and emblems and they still exist on manhole covers in modern Rome.

The edict issued by the emperor in ancient Rome applied both to the Senatus Populusque Romanus, or the senators and the citizens of the city of Rome.

During a visit to the city of Rome, a tourist noticed the mark, SPQR (Senates Populusque Romanus), on several municipal features including light posts and man hole covers.

stimulus (s), stimuli (pl)
1. Any form of energy capable of eliciting a reaction in a sense organ or in any excitable tissue.
2. A signal that alerts an organism or leads to a responsive action: "Heat and light are physical stimuli for a variety of responses."
3. Something that encourages an activity or a process to begin, to increase, or to develop: "The dog responded to the stimulus of the whistle."
4. An agent or factor that provokes interest, enthusiasm, or excitement.
5. Anything that causes something to happen, to progress, or to become more active: "When our company had a pay raise, it was a stimulus for greater production."
stratocumulus (s) (noun), stratocumuli (pl)
1. In meteorology, a principal cloud classification, characterized by gray or white, usually stratiform layers that nearly always have dark patches: Stratocumuli are usually arranged in orderly groups, lines, or waves, and composed of small water droplets, sometimes accompanied by larger droplets, soft hail, and (rarely) snowflakes.
2. A cloud formation in a low-lying extensive layer with large dark round or rolling masses.
A small sulcus.