Note: The trivium and quadrivium together made up the seven liberal arts. See Quadrivium.
2. (Zoöl.)
Defn: The three anterior ambulacra of echinoderms, collectively.
TRIWEEKLY
Tri"week`ly, a. Etym: [Pref. tri- + weekly.]
Defn: Occurring or appearing three times a week; thriceweekly; as, a triweekly newspaper. — adv.
Defn: Three times a week. — n.
Defn: A triweekly publication.
Note: This is a convenient word, but is not legitimately formed. It should mean occurring once in three weeks, as triennial means once in three years. Cf. Biweekly.
TROAD
Troad, n.
Defn: See Trode. [Obs.]