MANACCAN, a parish in the hundred of KERRIER, county of CORNWALL, 6 miles (S.W. by S.) from Falmouth, containing 591 inhabitants. The living is a discharged vicarage, in the archdeaconry of Cornwall, and diocese of Exeter, rated in the king's books at £4. 16. Of., and in the patronage of the Bishop of Exeter. The church, dedicated to St. Menacus and St. Dunstan, has lately received an addition of one hundred, free sittings, the Incorporated Society for the enlargement of churches and chapels having granted £ 13 towards defraying the expense. In this parish is the small port of Helford, and atTregonnell are the ruins of a chapel. In the vale of Manaccan, or Menachan, was discovered, several years since, a mineral substance, which, being analysed, was found to contain a new metal, called menachanite, and subsequently titanium.