Spiniferous: bearing, or clothed with spines.
Spiniform: in the form or shape of a spine.
Spinneret: the ligula in bombycid and some other larvae, modified for silk spinning: any organ consisting of an internal tube, terminating in a pore, spine or process, producing a silky or waxy fibre: in the plural, the organs concerned in the emission of the silky or cottony filaments of which the scales or sacs of Coccidae are produced: = fusulus.
Spinose -ous -ed: set with acute processes or spines.
Spinous-radiate: beset with spines in a circle, either concatenate, united at their bases, or setaceous, like bristles.
Spinulae: spinous processes at the apex of the tibia: also called spines, spurs or heels.
Spinulate -ose: set with little spines or spinules.
Spinules: little spines.
Spira: the coiled ovipositor of Cynipidae.
Spiracle -cula: a breathing pore: q.v.: in the plural the lateral openings on the segments of the insect body through which air enters the tracheae:= stigmata.