To remove the layer of scum from (a liquid etc.). / To remove (something) as scum. / To become covered with scum. / (obsolete) To scour (the land, sea etc.). / (obsolete) To gather together, as scum.

Arousing suspicion. / Distrustful or tending to suspect. / Expressing suspicion

(computing) An algorithm that computes a checksum.

plural of methylsulfonate