pseudomorph

noun

pseu·​do·​morph ˈsü-də-ˌmȯrf 

1

: a mineral having the characteristic outward form of another species

2

: a deceptive or irregular form

pseudomorphic

ˌsü-də-ˈmȯr-fik 

adjective

pseudomorphism

ˌsü-də-ˈmȯr-ˌfi-zəm 

noun

pseudomorphous

ˌsü-də-ˈmȯr-fəs 

adjective

Word History

Etymology

probably from French pseudomorphe, from pseud- + -morphe -morph

First Known Use

1839, in the meaning defined at sense 1