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A kernel; hence, a central mass or point about which
matter is gathered, or to which accretion is made; the central or
material portion; -- used both literally and figuratively. |
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The body or the head of a comet. |
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An incipient ovule of soft cellular tissue. |
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A whole seed, as contained within the seed coats. |
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A body, usually spheroidal, in a cell or a protozoan,
distinguished from the surrounding protoplasm by a difference in
refrangibility and in behavior towards chemical reagents. It is more or
less protoplasmic, and consists of a clear fluid (achromatin) through
which extends a network of fibers (chromatin) in which may be suspended
a second rounded body, the nucleolus (see Nucleoplasm). See Cell
division, under Division. |
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The tip, or earliest part, of a univalve or bivalve shell. |
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The central part around which additional growths are
added, as of an operculum. |
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A visceral mass, containing the stomach and other organs,
in Tunicata and some mollusks. |