- sacoA traditional Spanish unit of dry measure, equivalent to about 111 L.
- AccaophoriA member of a group of 4th century penitants who wore coarse clothing and used water for the Eucharist instead of wine. They have been considered offshoots of the Manichaeans and Marcionists, and were outlawed by Theodosius I along with the Encratites and Hydroparastatæ, with whom they are often confused.
- sacciferousBearing a sac.
- saccusA bladder or winglike structure found on the pollen grains of many species of conifer. The shape or number of the sacci on a pollen grain can help identify the species it came from.