tracheidogram

词干

中缀

后缀

-o-: A linking vowel inserted interconsonantally between two morphemes, to ease pronunciation, without contributing to the meaning. It frequently joins words or combining forms of Ancient Greek or Classical Latin origin in the classical compounds of New Latin and international scientific vocabulary, but it can also be used to join modern terms and even abbreviations, either formally or informally.
-gram: Something written, drawn or otherwise recorded. · A star polygon, with the number of outward/convex vertices (i.e.: points) indicated by the numeral prefix.

From tracheid +‎ -o- +‎ -gram.

1dendrochronologyA plot of the radial diameters of tracheids across an annual growth ring of a tree.