A feather or plume that is only partially developed or features only some of the characteristics of a full plume.

अर्धपंख या पंख जो पूरी तरह विकसित नहीं हुआ है।

English Usage: The bird's semiplume feathers are not as vibrant as its other plumes.

Hindi Usage: उस पक्षी के अर्धपंख उतने जीवंत नहीं हैं जितने उसके अन्य पंख।