Stroma
The fluid of the chloroplast surrounding the thylakoid membrane; involved in the synthesis
of organic molecules from carbon dioxide and water.
Stomata
One of the minute pores in the epidermis of a leaf or stem through which gases and water
vapor pass. Also called stomate
Stromatolite
Rock made of banded domes of sediment in which are found the most ancient forms of life:
prokaryotes dating back as far as 3.5 billion years.
Structural formula
A type of molecular notation in which the constituent atoms are joined by lines representing
covalent bonds.
Structural gene
A gene that codes for a polypeptide.
Style
In angiosperms, the stalk of a carpel, down which the pollen tube grows.
Stylet
Small needlelike appendage; especially the feeding organ of a tardigrade
Synapse
The junction across which a nerve impulse passes from an axon terminal to a neuron,
muscle cell, or gland cell.
Syrinx
The vocal organ of a bird, consisting of thin vibrating muscles at or close to the division of
the trachea into the bronchi.
subcutaneous lymph
The soft tissue immediately underlying the skin or epidermis.
Suberized
To cause to undergo suberization
Suberin
A waxy waterproof substance present in the cell walls of cork tissue in plants.
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