APS classification guide for submitted articles. An online encyclopedia mainly of hot topics in physics. Articles are unsolicited but peer reviewed. A companion website to the textbook by Louis Bloomfield.
Answers are at a non-technical level.
Purdue Libraries Dictionary Page Links to English dictionaries, International Dictionaries, Technical Dictionaries, Acronym Guides, Thesauri, and an online Almanac. Can search by Name, Acronym, Location, Subject, etc. Gateways PhysLINK Mainly a compilation of websites on many topics, although there is some original content as well.