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Related to anal sinus: pilonidal sinus, perianal sinus
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  • noun

Synonyms for sinus

References in periodicals archive ?
Outer lip evenly convex in side view, not serrated, anal sinus moderately deep, linguiform, its opening constricted, margin raised; inner edge of lip with 9-11 weak, ridge-like teeth, one at each end stronger than others, but in some specimens very irregular; inner lip smooth, shallowly sinuous, thinly calloused, parietal pad weak.
Outer lip flattened in side view, slightly serrated at ridge terminations, edge incurved; anal sinus moderately deep, linguiform, abapically directed, its opening constricted, its margin not raised; interior of lip with 7 ridges or small teeth, the strongest one at entrance to siphonal canal; inner lip smooth, with a flattened callus, parietal pad weak.