(1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites) second; sec; s; ses
(an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)) sulfur; S; sulphur; atomic number 16; ses
((thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work) randomness; entropy; S; ses
(a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)) selenium; Se; atomic number 34; ses