Term + definition card — the static-print substitute for the hover tooltip. Pre-defines jargon at the point of first use (margin-card variant), inline as a definition row inside body text (inline-row), or batched at the end of a chapter (grid). Optional `pronunciation` for terms loaned from another language (e.g. an Arabic gloss for an English technical term, or vice-versa). Optional `see_also` cross- references peer terms in the same glossary.