Though the primary headword seems to be presented here as neuter plural, it is more probably accusative singular (of mu/khs, on which see generally LSJ s.v.).
[1] cf. the scholia to Aristophanes, Wasps 262, where mu/khtes occurs. MacDowell ad loc writes: "'fungus', 'snuff', produced on the wicks of the lamps by the damp atmosphere".
[2] See LSJ s.v., and cf. under omicron 541.
[3] More exactly, the knobby end of the scabbard, as in e.g. Herodotus 3.64.3.
[4] Greek Anthology 5.263.1 (Agathias Scholasticus), a woman's night lamp symbolizes her lover's possible failure to rendezvous. Find another quote from this epigram at theta 433.