Disjoin, v. t. [imp. & p. p. Disjoined; p. pr. & vb. n. Disjoining.] — Webster enters it under “disjoin”
Etymology: [OF. desjoindre, F. disjoindre, déjoindre, fr. L. disjungere; dis- + jungere to join. See Join, and cf. Disjoint, Disjunct.]
To part; to disunite; to separate; to sunder. That marriage, therefore, God himself disjoins. Milton. Never let us lay down our arms against France, till we have utterly disjoined her from the Spanish monarchy. Addison. Windmill Street consisted of disjoined houses. Pennant.
Syn. -- To disunite; separate; detach; sever; dissever; sunder; disconnect.
1 other Webster entry under this spelling
Disjoin, v. i.
To become separated; to part.
Shades of meaning
Fernald lists disjoined only as an antonym, under adjacent.
He lists it without comment; the entries above explain its neighbors.