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Having, or consisting of, two superposed planes, aërocurves, or the like; of or pertaining to a biplane; as, a biplane rudder.

Of or pertaining to the biquadrate, or fourth power. Biquadratic equation (Alg.), an equation of the fourth degree, or an equation in some term of which the unknown quantity is raised to the fourth power. -- Biquadratic root of a number, the square root of the square root of that number. Thus the square root of 81 is…

Of or pertaining to the birch; birchen.

Of or pertaining to the day of birth, or its anniversary; as, birthday gifts or festivities.

Of or pertaining to Biscay in Spain. -- n.

Of or pertaining to bismuth; containing bismuth, when this element has its higher valence; as, bismuthic oxide.

Pertaining to leap year.

Of or pertaining to the days in the calendar not marked with red letters as saints' days. Hence: Unlucky; inauspicious.

Of or pertaining to the Blackfeet; as, a Blackfoot Indian. -- n.

Of or pertaining to the blastoderm.

Pertaining to, consisting of, or containing, blende.

Of, pertaining to, or resembling, the blennies.

Enjoying, or pertaining to, spiritual happiness, or heavenly felicity; as, the blessed in heaven. Reverenced like a blessed saint. Shak. Cast out from God and blessed vision. Milton.

Of or pertaining to the body, in distinction from the mind. "Bodily defects." L'Estrange.

Of or pertaining to Sir Thomas Bodley, or to the celebrated library at Oxford, founded by him in the sixteenth century.

Of or pertaining to Boeotia; hence, stupid; dull; obtuse. -- n.

Of or pertaining to Bohemia, or to the language of its ancient inhabitants or their descendants. See Bohemian, n., 2.

Of or pertaining to bole or clay; partaking of the nature and qualities of bole; clayey.

Pertaining to, or obtained from, the Boletus. Boletic acid, an acid obtained from the Boletus fomentarius, variety pseudo-igniarius. Same as Fumaric acid.

Of or pertaining to Bolivia. -- n.