Misspelling of necessary.

(nautical) To operate or use or ride atop a hydrofoil wing on a hull so equipped.

(organic chemistry) The diterpenoid (4aS,5R,6R,6aR,7S,11aS,11bR)-5,6-dihydroxy-4,4,11b-trimethyl-1,2,3,4a,5,6,6a,7,11,11a-decahydronaphtho[2,1-f][1]benzofuran-7-carboxylic acid in the seeds of Pter...

(attributive) A technique in which the necessary conditions for a state are identified and then a proof that these conditions cannot be satisfied is produced.