secundine

The botanist carefully examines the secundine under a microscope.

Definition

1. Noun:
   • Botanical term: "secundine" refers to the inner integument or covering of the ovule in seed plants. It is the layer that develops into the seed coat after fertilization, protecting the embryo.

Usage Examples

• Noun:
  • The secundine is the innermost layer of the ovule, which later becomes part of the seed coat. (The inner covering of the ovule.)
  • In many flowering plants, the secundine fuses with the outer integument to form a protective seed covering. (The inner layer joins with the outer layer.)

Advanced Usage

• Comparative anatomy: In some botanical texts, "secundine" is used to distinguish the inner integument from the "primine" (the outer integument).
  • The primine and secundine together enclose the nucellus, with the secundine being the one closest to the embryo sac. (The two layers surround the central part of the ovule.)

Variants and Related Words

• Secundine (plural: secundines) (n): the inner integument of an ovule.
  • The secundines of different plant species vary in thickness and structure. (The inner layers vary.)

Synonyms

• Inner integument: the botanical term for the innermost covering layer of an ovule.
• Endostome: the opening or canal through the inner integument (secundine) of an ovule.

Related Idioms

• None: "secundine" is a highly specialized technical term without idiomatic use.