A board foot is one foot long, one foot wide and one inch in thickness. Checking the Waste Mary Huston Gregory This is usually expressed in pounds per thousand board feet, a board foot being considered as one-twelfth of a cubic foot.
Sibilance is a manner of articulation of fricative and affricate consonants, made by directing a stream of air with the tongue towards the sharp edge of the teeth, which are held close together; a consonant that uses sibilance may be called a sibilant, or a strident.
sibilant. adj. 1. (Phonetics & Phonology) phonetics relating to or denoting the consonants (s, z, /Ê/, /Ê/), all pronounced with a characteristic hissing sound. 2. having a hissing sound: the sibilant sound of wind among the leaves.