Seen on a prescription, tid means three times a day. It is an abbreviation for "ter in die" which in Latin means three times a day. The abbreviation "tid" is sometimes written without a period either in lower-case letters as "tid" or in capital letters as "TID" or with periods as "t.i.d." However it [..]

Three times each day

Abbreviation for traveling ionospheric disturbances.

– three times a day

means in tide, in season, in time. We retain the word in even-tide, spring-tide, and so on. Tusser has the phrase, “If the weather be fair and tidy,” meaning seasonable. Things done [..]

Transit Improvement Districts

An abbreviation for “three times a day.” The abbreviation is commonly used in drug dosing instructions.

, Tidge, sb. a fine warm bed for crops; adj. the quality of soil that is fit for the reception of seed. ‘That ground is in fine tid,’ i.e. pulverised and dry.

Tactical information display, a round display screen, nine inches in diameter, in the F-14’s rear cockpit. Symbols showed radar targets and other situation information.

See the entry for "Terminal Identification Number (TID)"

(obsolete) tender; soft; nice