pit

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1. a hollow fovea or indentation.
2. a pockmark.
3. to indent, or to become and remain for a few minutes indented, by pressure.
4. seed of a fruit, e.g. cherry. Strictly refers to the hard woody coating which surrounds the seed.

• anal p. — the proctodeum of the embryo.
• auditory p. — a distinct depression in each auditory placode, marking the beginning of the embryonic development of the internal ear.
• p. bull — a term used in describing various types of dogs used in past times for fighting in pits. Now, usually refers to the specific breed, american pit bull terrier.
• lens p. — a pitlike depression in the fetal head where the lens develops.
• nasal p. — a depression appearing in the olfactory placodes in the early stages of development of the nose. Called also olfactory pit.
• olfactory p. — see nasal pit (above).
• otic p. — early stage in the development of the embryonic inner ear.
• p. pony — pony used in a mine to haul mined rock. Breed varies as long as it is small, e.g. Shetland pony.
• p. of stomach — the epigastric fossa or epigastric region.
• p. viper — see viper.

1. a small depression in enamel, usually located in a developmental groove where two or more enamel lobes are joined. n 2. a depression in a restoration resulting from nonuniform density.