Definify.com
Webster 1913 Edition
Heartseed
Heart′seedˊ
(härt′sēdˊ)
, Noun.
 (Bot.) 
A climbing plant of the genus 
Cardiospermum
, having round seeds which are marked with a spot like a heart. Loudon.
 Definition 2025
heartseed
heartseed
English
Noun
heartseed (countable and uncountable, plural heartseeds)
-  Any plant of the genus Cardiospermum, climbing plants with round seeds marked with a spot like a heart.
- (Can we find and add a quotation of Loudon to this entry?)