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Insertion of sigma.—Between root (or stem) and suffix ς is often found, and in some cases it has become attached to the suffix. This parasitic letter spread from the perfect middle, where it is properly in place only in stems in τ, δ, θ, or ς; as in σχι-σ-μό-ς cleaving with ς from ἔ-σχι-σ-μαι by analogy to ἔ-σχισ-ται for ἐ-σχιδ-ται (σχίζω cleave). In -σ-της the transference was made easier by words like σχισ-τός cloven for σχιδ-τος. This ς appears before many suffixes, and usually where the perfect middle has acquired it (489).
μα· σπά-σ-μα spasm (σπάω rend, ἔσπασμαι), κέλευ-σ-μα command (κελεύ-ω command, κεκέλευσμαι), μία-σ-μα stain (μιαίνω stain, μεμίασμαι).— μο : σπα-σ-μός ῀ σπά-σ-μα, κελευ-σ-μός command.— μη : δύ-σ-μη setting (δύ̄ω set).— της : κελευσ-τής signal-man, ὀρχη-σ-τής dancer (ὀρχ-έ-ομαι dance), δυνά-σ-της lord (δύνα-μαι am able). Also in δρα-σ-τήριος efficacious (δρά-ω do), ὀρχή-σ-τρᾱ dancing-place, πλη-σ-μόνη fulness. -σ-μ has displaced δμ, -θ-μ (832) in ὀσμή odour (earlier ὀδμή), ῥυ-σ-μός (and ῥυ-θ-μός) rhythm.