trifid (adj.) Look up trifid at Dictionary.com
"divided into three lobes," 1620s, from Latin trifidus "cleft in three," from tri- "three" (see tri-) + -fid. This adjective probably inspired triffid, the name of the three-legged walking poisonous plants in John Wyndham's novel "The Day of the Triffids" (1951).