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anything that hinders progress; a hindrance; an obstruction, physical or moral. If all obstacles were cut away. And that my path were even to the crown. Shak.

An instrument of eight strings; a system of eight tones. [Also written octochord.]

Assisting the sense of hearing; as, an otacoustic instrument.

An instrument to facilitate hearing, as an ear trumpet.

do or beyond; to exceed in acting. [R.] He has made me heir to treasures Would make me outact a real window's whining. Otway.

See Cosmolabe.

Of pertaining to, or characterized by, parataxis.

The Spanish dollar; -- called also patacoon. [Obs.]

A tender to a fleet, formerly used for conveying men, orders, or treasure. [Spain & Portugal]

See Pataca.

Having five capsules.

A dry fruit composed of five carpels, which are covered by an epigynous calyx and separate at maturity.

A chloride having five atoms of chlorine in each molecule.

An ancient instrument of music with five strings.

Capable of neutralizing, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; -- said of certain complex bases.

A figure composed of two equilateral triangles intersecting so as to form a six-pointed star, -- used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages.

Composed of five united carpels with one seed in each, as certain fruits.

See Penteconter.

A red and purple pigment found in certain crinoids of the genus Pentacrinus.

Any species of Pentacrinus.