D size battery
Refers specifically to the D-size dry cell battery, commonly used in flashlights and portable radios.
This flashlight uses D size batteries.
noun which may take the genitive case particle 'no'
monomorphic
Technical term in biology or chemistry meaning having a single form or structure; not commonly used in everyday conversation.
This species has monomorphic leaves.
Standard kanji spelling for the battery size; the numeral １ is part of the form.
Alternate kanji spelling using 一 instead of １; less common but valid.
Compound of 単 (single) + 一 (one) + 形 (type/form). The battery sense derives from the standardized naming of dry cell sizes in Japan.