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.
Another example of a regular change is the sibilant assimilation of Sanskrit, wherein if there were two different sibilants as the onset of successive syllables, a plain /s/ was always replaced by the palatal /É/: 1  Proto-Indo-European *smeá¸±ru- beard > Skt. 2  PIE *á¸±oso- gray > Skt. 3  PIE *sweá¸±ru- husband's mother' > Skt.